add another call to use "ps aux"
add another call to use "ps aux"

Signed-off-by: Alfredo Deza <3ae498813ac9b6992b3bb72690656738fc9b4e19@inktank.com>

ivotron/teuthology,ktdreyer/teuthology,michaelsevilla/teuthology,tchaikov/teuthology,dreamhost/teuthology,ktdreyer/teuthology,SUSE/teuthology,robbat2/teuthology,t-miyamae/teuthology,zhouyuan/teuthology,yghannam/teuthology,michaelsevilla/teuthology,ceph/teuthology,dmick/teuthology,t-miyamae/teuthology,yghannam/teuthology,ivotron/teuthology,tchaikov/teuthology,dmick/teuthology,SUSE/teuthology,SUSE/teuthology,robbat2/teuthology,ceph/teuthology,zhouyuan/teuthology,caibo2014/teuthology,caibo2014/teuthology,dmick/teuthology,dreamhost/teuthology