common: add new rpmbuild test

[glimchb]

From #20 and spdk/spdk#3615
fails on

RPM build errors:
    File not found: /opt/spdk/test/packaging/rpm/test-rpm/build/spdk-v26.05-build/BUILDROOT/usr/local/lib/python3.14/site-packages/spdk*/*

[glimchb]

after this patch is merged:

• 27978: python/Makefile: Support DESTDIR for installation | https://review.spdk.io/c/spdk/spdk/+/27978

rpms are created successfully:

Wrote: /opt/spdk/test/packaging/rpm/test-rpm/srcrpm/spdk-v26.05-1.src.rpm
Wrote: /opt/spdk/test/packaging/rpm/test-rpm/rpm/x86_64/spdk-scripts-v26.05-1.x86_64.rpm
Wrote: /opt/spdk/test/packaging/rpm/test-rpm/rpm/x86_64/spdk-v26.05-1.x86_64.rpm
Wrote: /opt/spdk/test/packaging/rpm/test-rpm/rpm/x86_64/spdk-devel-v26.05-1.x86_64.rpm

but new failure:

+ 01:19:38 packaging.rpm_packaging.build_shared_rpm -- test/packaging/rpm/rpm.sh@105: sudo rpm -i /opt/spdk/test/packaging/rpm/test-rpm/rpm//x86_64/spdk-devel-v26.05-1.x86_64.rpm /opt/spdk/test/packaging/rpm/test-rpm/rpm//x86_64/spdk-scripts-v26.05-1.x86_64.rpm /opt/spdk/test/packaging/rpm/test-rpm/rpm//x86_64/spdk-v26.05-1.x86_64.rpm
error: Failed dependencies:
	/var/spdk/dependencies/pip/bin/python3 is needed by spdk-v26.05-1.x86_64

fixed by https://review.spdk.io/c/spdk/spdk/+/27986