Revert "Moved the sogo webmail configuration file to conf-* directories instead of the sites-* ones"

This reverts commit e1c01a62d29c21c9bde0d6cee1e94e5670d69862.
Revert "Fixed the server url to stick to https or http depending on the kind of request"

This reverts commit 41af5aa282664bbb50eb44d57624fc18d02a2224.
Merge pull request #1156 from Zentyal/cperello/revert-sogo-webmail-changes

Cperello/revert sogo webmail changes