LU-17098 tests: fix sanity-pcc failures on Ubuntu

LU-17098 tests: fix sanity-pcc failures on Ubuntu

A few sanity-pcc test fail due to the system setup. One of those
failures was due to uidmap not installed on my Ubuntu system.
The rest of the test failures was due to assuming uid / guid
were set values (500 and 1000) which is not the case for all
systems.

Test-Parameters: trivial testlist=sanity-pcc
Change-Id: I667f399854d626d4b22efed2b341ad5c330e0cfe
Signed-off-by: James Simmons <jsimmons@infradead.org>
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/52310
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Qian Yingjin <qian@ddn.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>