lib/oeqa/runtime: rpm: add install and erase tests

lib/oeqa/runtime: rpm: add install and erase tests

Copies to target rpm-doc file from deploy_dir
and tries to install and then remove that package.
rpm-doc was chosen because it's small, it only adds
a few files to target, and it's almost always found in
deploy_dir for images with package-management/rpm.

(From OE-Core rev: a2d2f2b7b111863d3c50dedded37aab813d9634f)

Signed-off-by: Stefan Stanacar <stefanx.stanacar@intel.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>