gnome-control-center: Several fixes

This update fixes various issues with the password selection dialog in gnome-control-center:
- bnc#796932: password hints are not implemented so do not allow setting one
- bnc#779414: remove random password generation which has an unpackaged dependency
- bnc#779408: temporarily remove "password to be set at next login" and "login without password" options
- bnc#779413: ensure the new password is different from the old password and avoid a hang.

Fixed bugs
bnc#796932
Password hints don't work
bnc#779414
Choose generated password option broken
bnc#779408
Password to be set at next login / login without password do not work
bnc#779413
System Settings hangs when changing password if old password is same as new password
Selected Binaries
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