Reva is moving away from the hardcoded "insecure" setting for LDAP
connections. For this to happend ocis needs some adjustments. In order
to avoid an "insecure" by default config in ocis this commit adds the
new parameters "insecure" and "cacert" to the LDAP configuration for the
auth-, user- and groups-provider. To make the out of the box experience
as smooth as possible the default setting for "cacert" points to the
certificate that is generated for glauth on startup.
