LDAP_SERVER_PORT currently unused

[Robbilie]

LDAP_SERVER_PORT is currently not used and the port and protocol has to be included in the LDAP_SERVER_HOST
the PORT env var has to be set though otherwise an error is thrown

#124 (comment)

[primetheus]

@Robbilie it looks like we implemented the variables, but only use the LDAP_SERVER_HOST when making the connection. This should be a simple fix. I'll try to get that kicked out this week

[primetheus]

This line is where the server connection is initialized, so we need to incorporate some pre-init logic to build an ldap3.Server instance and use that instead of the environment variable