package_rpm.bbclass: handle pre/post remove scriptlets

package_rpm.bbclass: handle pre/post remove scriptlets

Currently the scriptlet_wrapper is designed to handle only pre/post
install scriptlets. This patch will slightly change the wrapper script
to handle also pre/post remove scriptlets when we want to remove
packages from the final image.

(From OE-Core rev: aea47c77d69407b2e62f151cabba35293d179f0c)

Signed-off-by: Laurentiu Palcu <laurentiu.palcu@intel.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>