rpm: update to 4.14.0

rpm: update to 4.14.0

Previously oe-core had a development snapshot of rpm, it's better to update
to something more stable.

Removed patches:
0001-Add-PYTHON_ABI-when-searching-for-python-libraries.patch
(upstream is using pkg-config)
0001-When-nice-value-cannot-be-reset-issue-a-notice-inste.patch
(functionality has been moved to a plugin, we disable plugins
for rpm-native)
0012-Use-conditional-to-access-_docdir-in-macros.in.patch
(merged upstream)

Changed patches:
0001-Fix-build-with-musl-C-library.patch
(one previous musl issue has been resolved upstream; another has been added)

Rest of the patches are trivial rebases.

Update the signing oe-selftest so that the reference output matches
the upstream changes.

(From OE-Core rev: b4613b6ce07c295c5d6de6861acf19315acaccb2)

Signed-off-by: Alexander Kanavin <alexander.kanavin@linux.intel.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>