Merge commit 'v2.2.0.1' into stable-2.2

* commit 'v2.2.0.1':
  Release Ganeti 2.2.0.1

Conflicts:
	NEWS
	  - merge
	configure.ac
	  - keep 2.2.1~rc0 version

Signed-off-by: Guido Trotter <ultrotter@google.com>
Reviewed-by: Luca Bigliardi <shammash@google.com>