if a collection has no name, use a UUID on import

Fixes #1100838, some SUSE repositories don't have that name element.
Updates for 2.5.1 becoming 2.6.0
Merge pull request #598 from bmbouter/updates-for-2-6-release-stream

Updates for 2.5.1 becoming 2.6.0
Merge branch 'bz_1100838' of github.com:ATIX-AG/pulp_rpm into ATIX-AG-bz_1100838
Adding 2.5.0 release notes
Merge pull request #599 from mhrivnak/release-notes

Adding 2.5.0 release notes
Merge branch 'release-notes' into 2.6-dev

Conflicts:
	docs/user-guide/release-notes/2.5.x.rst
Automatic commit of package [pulp-rpm] release [2.6.0-0.1.alpha].
Adds troublesooting section, and adds release notes to index
Merge pull request #600 from bmbouter/2.5-release-note-fixes

Adds troublesooting section, and adds release notes to index
Merge branch '2.5-release' into 2.6-dev
Automatic commit of package [pulp-rpm] release [2.5.0-1].
Merge branch '2.5-release' of github.com:pulp/pulp_rpm into 2.5-release
fix merge conflicts in changelog