Card online_runtime_157

Provide PostgreSQL 9.2 via SCL for RHEL

- Rename $OPENSHIFT_POSTGRES_VERSION to $OPENSHIFT_POSTGRESQL_VERSION
  for consistency
- Bump cartridge version to 0.3.0.
- Tweak rhcsh for 9.2-compatibility
- Internal changes in openshift-origin-cartridge-postgresql.spec
Update $OPENSHIFT_POSTGRES_VERSION for existing cartridges
No need for Ruby SCL here.
Match up "Provides" with what's overridden
There is no Group-Overrides needed
Conflicts: is obsolete.
Merge pull request #2925 from BanzaiMan/dev/hasari/c157

Merged by openshift-bot
Handling cleanup of failed pending op using rollbacks
Merge pull request #2975 from abhgupta/abhgupta-dev

Merged by openshift-bot
Moving Node classes into Runtime namespace
Removing UnixUser
Moving functionality into SELinux plugin class
Refactor code to call set_ro_permission/set_rw_permission instead of calling chown/chcon
Refactor code to use run_in_container_context/run_in_root_context calls instead of generically calling oo_spawn and passing uid.
Modify frontend httpd/proxy classes to accept a container object instead of indivigual properties
Explicitly create a group for the gear user and fail if group cannot be created.
Moving selinux and libvirt container plugins into seperate gem files
Added nsjoin which allows joining a running container
Temporarily disabled cgroups
Moved gear dir to /var/lib/openshift/gears for libvirt container
Moved shell definition into container plugin rather than application container
Make port-forwarding container specific.
  * SELinux container uses port-proxy
  * Libvirt container uses IP Tables
Fixing tests (assuming selinux container for now)
Changing File.join to PathUtils.join in node and common packages
Uncommenting cgroups
Fixing signal handling in oo-gear-init
Renamed package to Containerization instead of ApplicationContainerPlugin
Renamed OpenShift_ApplicationContainer_Class to container_plugin_class and made it a class variable instead of global
Moved run_in_root_context to ApplicationContainer since it is not implementation specific
Cleanup unused variables
Adding traffic control for selinux container
Fixing class/module namespaces
Fixing tests
Fixing rebase errors
Un-hardcode context in step_definitions/cartridge-php_steps.rb
Fixing paths that were broken when going from File.join -> PathUtils.join