Remove useless %excludes

Conflicts:
	cobbler.spec
Drop %defattr

Conflicts:
	cobbler.spec
Use python2

Conflicts:
	cobbler.spec
openssl is needed in cobbler-web %post
Nothing provides python2-devel in openSUSE

Conflicts:
	cobbler.spec
Merge pull request #1062 from opoplawski/release26

Spec cleanup