Merge branch 'devel-2.2'

* devel-2.2:
  QA: Test more tag operations via RAPI
  qa_rapi: Fix indentation error
  opcode summary: improve display for list summaries
  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

Conflicts:
	lib/backend.py: Trivial

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