Copy the RHEL6 eventlet workaround from Oslo

Tests in oslo-incubator now need the horrendous hack to workaround an
issue with eventlet on RHEL6. We've moved the patch_tox_venv tool
and redhat-eventlet.patch into oslo-incubator, so add them to
openstack-common.conf.

Change-Id: I1acfec282b64d7582144b155119bedb1741db2f7
Imported Translations from Transifex

Change-Id: Ia061d1b4580b4363a734b571f25755e50feab119
Merge "Imported Translations from Transifex"
Merge " Copy the RHEL6 eventlet workaround from Oslo"