install: rpm: only one option per variable
install: rpm: only one option per variable

Although the variables are entitled, e.g., "pkg_mng_opts" they
really can only contain at most one option. Here's what happens
when they contain more than one:

Running: "sudo zypper '-n --no-gpg-checks' install --capability --no-recommends ceph-radosgw"
stderr:Unknown option ' '
stderr:Unknown option '-'
stderr:Unknown option '-'

Signed-off-by: Nathan Cutler <f9d8c66a4e898e67db786769b5b347b640e1a9a6@suse.com>

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