package_rpm.bbclass: Fix an issue where complementary installs fail

package_rpm.bbclass: Fix an issue where complementary installs fail

Also ensure that we always cleanup the temporary install manifest files,
some of them will cause problems if they exist in multiple install
attempts.

Finally verify that the lists remain uniquely sorted otherwise the
complementary install may install the same files numerous times,
triggering a failure.

(From OE-Core rev: 4f2a290cbcc6c21afbb2a6e6148efdef4d135b41)

Signed-off-by: Mark Hatle <mark.hatle@windriver.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>