LU-13063 tests: remove checks for old RHEL versions

LU-13063 tests: remove checks for old RHEL versions

There was a check in sanity test_17g for RHEL6.5, but we haven't been
testing that client version for some time, and 6.5 no longer works on
master.  Remove this check entirely

Similarly, is_project_quota_supported() was trying to check for RHEL7,
but the lfs check was being done on the client.  It was also wrong for
RHEL8 kernels, and would incorrectly match any version with a "7" in
it.  Move lfs check to the MDS, and don't check the kernel version.

Test-Parameters: trivial testlist=sanity-quota
Signed-off-by: Andreas Dilger <adilger@whamcloud.com>
Change-Id: If115b65ba8bc09b6c292ec9cf2e949c8153ebbe5
Reviewed-on: https://review.whamcloud.com/37272
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Reviewed-by: James Nunez <jnunez@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>