LU-10947 build: test if xfsprogs are installed

LU-10947 build: test if xfsprogs are installed

We need xfsprogs because conf-sanity test_116 use mkfs.xfs. No
need to install the xfsprogs for a single test so just skip the
test if mkfs.xfs is not available. Set $tmpmnt to $TMP/$tdir
since /mnt is read only for my diskless setup. The $TMP is not
in my setup.

Test-Parameters: trivial testlist=conf-sanity mdsdistro=sles12sp3 ossdistro=sles12sp3

Change-Id: I1db88afe7e382e1032ed7e2844a1dec1c032530e
Signed-off-by: James Simmons <uja.ornl@yahoo.com>
Reviewed-on: https://review.whamcloud.com/32539
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: James Nunez <jnunez@whamcloud.com>