qa: add workunit for testing rgw datacache

qa: add workunit for testing rgw datacache

Add a workunit for testing the rgw object cache
by using s3cmd to write objects and then
verify the objects in the cache.

Also move the 0-install.yaml file out of tasks and
into the main dir for the rgw/verify subsuite.

Signed-off-by: Ali Maredia <amaredia@redhat.com>
qa: d3n: add debug logs

Signed-off-by: Ali Maredia <amaredia@redhat.com>
rgw: s3n: qa: fix netstat search for rgw process

Signed-off-by: Mark Kogan <mkogan@redhat.com>