Merge branch 'stable-2.2' into devel-2.2

* stable-2.2:
  cmdlib: Fix type of “name” parameter for tag operations
  rlib2: Set tag operation param “name” to None for cluster tags
  Fix OS_VARIANT variable setting

Signed-off-by: Michael Hanselmann <hansmi@google.com>
Reviewed-by: Iustin Pop <iustin@google.com>