Merge remote branch 'devel-2.1'

* devel-2.1:
  Extend ConfdFilterCallback with consistency checks
  Abstract the confd client creation
  Remove unused import from test file
  kvm_flag hypervisor parameter
  Move the runas user at execution time
  Send "501 Not Implemented" back when method not found
  Adding QA RAPI tests for activate-disks and deactivate-disks calls
  SerializableConfigParser: Make Loads class indep
  Unbreak command line job submission
  Allow file storage to be grown
  Write grow support for file storage
  Watcher: fix some doc typos
  Watcher: do not warn for missing hooks dir
  Extend the hypervisor API with name-only shutdown
  Distribute list of enabled hypervisors in ssconf

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