orchestra/run: fix string handling
orchestra/run: fix string handling

Signed-off-by: Kyr Shatskyy <82d0c7561ff7e9a20a19db22e8fb5b2adaa3d71e@suse.com>

SUSE/teuthology,SUSE/teuthology,ktdreyer/teuthology,ceph/teuthology,SUSE/teuthology,dmick/teuthology,ceph/teuthology,dmick/teuthology,dmick/teuthology,ktdreyer/teuthology