consumer - updates to support applicable errata

Minor update to allow users to obtain 'applicable' errata information
for one or more consumers, based upon 0 or more repo ids.
unit copy - updates for pulp improvements in unit associate/copy

This commit contains minor changes to allow a user to take
advantage of pulp improvements for copying large repos.

Refer to https://bugzilla.redhat.com/show_bug.cgi?id=953665
for more details.
vcr cassette updates for pulp 2.1.1-0.5.beta
vcr cassette updates for pulp 2.1.1-0.5.beta - continued...
Merge pull request #57 from bbuckingham/pulpv2-updates

pulp - updates for consumer errata, repo copy and vcr cassettes