In case when some partition has keep_data = True
need to elevate flag to file system level and
do not to create new partition table. Do not clean
file system when it has keep_data = True.
There should not be a problem if some raw data
will not be cleaned.
Change-Id: Ifccc9256b12944283219cffeedb8c8da8ab420f8
Implements: blueprint partition-preservation
68494fb0dd