LU-14677 sec: migrate/extend/split on encrypted file

LU-14677 sec: migrate/extend/split on encrypted file

lfs migrate/extend/split makes use of volatile files to swap layouts.
When operation is carried out on an encrypted file, the volatile file
must be assigned the same encryption context as the original file, so
that data moved/copied to different OSTs is identical to the original
file's.
Also update sanity-sec test_52 to exercise these commands.

Signed-off-by: Sebastien Buisson <sbuisson@ddn.com>
Change-Id: I3878b5e9e6d3738dfee0ce0f89a3646e6a7b976f