engine: Adding support for lock to survive restart

The following patch will add the following functionality:
1. Introduced annotation parameter which should add a possibility not to relase in memory lock
   in the end of execute
2. By using this parameter we are enforcing command to release a lock only after that all
   child commands are finished
3. Added code which should solve restart problem - added acquireLockAsyncTask method

Change-Id: I8c73dac12f6f56ce92a16f94d3b49e0795ab2e46
Signed-off-by: Michael Kublin <mkublin@redhat.com>