LU-11759 tests: racer cleanup

LU-11759 tests: racer cleanup

1. set LCTL in do_nodes $clients $racer so that lustre_build_version
   worked correctly
2. list processes for ps -C properly
3. clear trap ERR in racer routines which sources test-framework.sh

Cray-bug-id: LUS-6592
Signed-off-by: Vladimir Saveliev <c17830@cray.com>
Change-Id: I667efd58004fbe02e79b3c02032133ea41f5337b
Test-Parameters: testlist=racer
Reviewed-on: https://review.whamcloud.com/33831
Tested-by: Jenkins
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Elena Gryaznova <c17455@cray.com>
Reviewed-by: Alexandr Boyko <c17825@cray.com>
Reviewed-by: James Nunez <jnunez@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>