Add tests for reading config files

internal/config/testdata/generate_certs_config.ini

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+[moneygo]
+
+# Whether to serve as FastCGI (default is false, for HTTPS)
+fcgi = false
+
+# Port on which to serve HTTPS or FCGI
+port = 8443
+
+# Base directory for serving files out of. This should point to the root of the
+# moneygo source directory
+base-directory = src/github.com/aclindsa/moneygo/
+
+# Type of database being used (sqlite3, mysql, postgres)
+db-type = sqlite3
+
+# 'Data Source Name' for the database being used. This is driver-specific. See
+# the following examples and external resources for more information about
+# configuring this for your particular database configuration:
+#
+#     Sqlite example DSN: "file:moneygo.sqlite?cache=shared&mode=rwc"
+#    MySQL documentation: https://github.com/go-sql-driver/mysql/#dsn-data-source-name
+#            example DSN: "user:password@tcp(localhost)/dbname&parseTime=true"
+#                         (Note: MySQL DSN's *must* include the
+#                          "parseTime=true" parameter)
+# Postgres documentation: https://godoc.org/github.com/lib/pq
+#            example DSN: "postgres://user:password@localhost/dbname"
+db-dsn = file:moneygo.sqlite?cache=shared&mode=rwc
+
+
+[https]
+# If 'fcgi = false', the following paths to a SSL certificate and the paired
+# private key are used when serving HTTPS
+cert-file = ./local_cert.pem
+key-file = ./local_key.pem
+
+# Attempt to generate self-signed certificates if the certificate files
+# specified above are missing or invalid. This should *never* be set to 'true'
+# for any environment where security is important (including but not limited to
+# production systems)
+generate-certs-if-absent = true
+# A CSV list of hostnames to generate the above certs for
+generate-certs-hosts = example.com

internal/config/testdata/postgres_fcgi_config.ini

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+[moneygo]
+
+# Whether to serve as FastCGI (default is false, for HTTPS)
+fcgi = true
+
+# Port on which to serve HTTPS or FCGI
+port = 9001
+
+# Base directory for serving files out of. This should point to the root of the
+# moneygo source directory
+base-directory = src/github.com/aclindsa/moneygo/
+
+# Type of database being used (sqlite3, mysql, postgres)
+db-type = postgres
+
+# 'Data Source Name' for the database being used. This is driver-specific. See
+# the following examples and external resources for more information about
+# configuring this for your particular database configuration:
+#
+#     Sqlite example DSN: "file:moneygo.sqlite?cache=shared&mode=rwc"
+#    MySQL documentation: https://github.com/go-sql-driver/mysql/#dsn-data-source-name
+#            example DSN: "user:password@tcp(localhost)/dbname&parseTime=true"
+#                         (Note: MySQL DSN's *must* include the
+#                          "parseTime=true" parameter)
+# Postgres documentation: https://godoc.org/github.com/lib/pq
+#            example DSN: "postgres://user:password@localhost/dbname"
+db-dsn = postgres://moneygo_test@localhost/moneygo_test?sslmode=disable
+
+
+[https]
+# If 'fcgi = false', the following paths to a SSL certificate and the paired
+# private key are used when serving HTTPS
+cert-file = ./cert.pem
+key-file = ./key.pem
+
+# Attempt to generate self-signed certificates if the certificate files
+# specified above are missing or invalid. This should *never* be set to 'true'
+# for any environment where security is important (including but not limited to
+# production systems)
+generate-certs-if-absent = false
+# A CSV list of hostnames to generate the above certs for
+generate-certs-hosts = localhost,127.0.0.1

internal/config/testdata/sqlite_https_config.ini

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+[moneygo]
+
+# Whether to serve as FastCGI (default is false, for HTTPS)
+fcgi = false
+
+# Port on which to serve HTTPS or FCGI
+port = 8443
+
+# Base directory for serving files out of. This should point to the root of the
+# moneygo source directory
+base-directory = src/github.com/aclindsa/moneygo/
+
+# Type of database being used (sqlite3, mysql, postgres)
+db-type = sqlite3
+
+# 'Data Source Name' for the database being used. This is driver-specific. See
+# the following examples and external resources for more information about
+# configuring this for your particular database configuration:
+#
+#     Sqlite example DSN: "file:moneygo.sqlite?cache=shared&mode=rwc"
+#    MySQL documentation: https://github.com/go-sql-driver/mysql/#dsn-data-source-name
+#            example DSN: "user:password@tcp(localhost)/dbname&parseTime=true"
+#                         (Note: MySQL DSN's *must* include the
+#                          "parseTime=true" parameter)
+# Postgres documentation: https://godoc.org/github.com/lib/pq
+#            example DSN: "postgres://user:password@localhost/dbname"
+db-dsn = file:moneygo.sqlite?cache=shared&mode=rwc
+
+
+[https]
+# If 'fcgi = false', the following paths to a SSL certificate and the paired
+# private key are used when serving HTTPS
+cert-file = ./cert.pem
+key-file = ./key.pem
+
+# Attempt to generate self-signed certificates if the certificate files
+# specified above are missing or invalid. This should *never* be set to 'true'
+# for any environment where security is important (including but not limited to
+# production systems)
+generate-certs-if-absent = false
+# A CSV list of hostnames to generate the above certs for
+generate-certs-hosts = localhost,127.0.0.1