Revert "Allow sysadmins to define static responses which are immutable for the user"

This reverts commit 84ffd59c0c3ff78bca5fbcd2c8893b741f36c9ba.
Revert "Backported the canned responses feature to this release branch"

This reverts commit 92a3c4020d891ebf66b19ee337b05eafec3ff56b.
Integrate patch with more configuarion possibilities to LDAP (#1488753)