LU-3979 tests: archive access must be done on agent

LU-3979 tests: archive access must be done on agent

In sanity-hsm tests, all access to archive backend
must be done from an agent, so all the command which
access it are executed through a do_facet $SINGLEAGT
Modified tests are 10a 10b 10c 11 12a 12b 12d 12n 13 25a 30a
110a 111a 222a
When doing remote commands on agent, we cannot use default
environnement variables. So test 106 must use explicitly the
lustre mount point when calling get_client_uuid.

Signed-off-by: JC Lafoucriere <jacques-charles.lafoucriere@cea.fr>
Change-Id: I245069655d2dcf20d1c316c8b9e166cbd8ee4e98
Reviewed-on: http://review.whamcloud.com/7730
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Jinshan Xiong <jinshan.xiong@intel.com>
Reviewed-by: John L. Hammond <john.hammond@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>