Adds a plugin.misc helper function get_parent_directory with tests
1145320 - document running pulp-manage-db after installation.
1081518 - Add help documentation for retrieving a single distributor or importer
apply review comments.
Update for PR comments
Merge pull request #1206 from pulp/barnabycourt-1081518

1081518 - Add help documentation for retrieving a single distributor or ...
rebase 2.4-release.
Merge branch '2.4-release' into jortel-1145320

Conflicts:
	docs/sphinx/user-guide/server.rst
1138356 - adding docs on how to backup pulp
further merging.
Merge pull request #1198 from pulp/jortel-1145320

1145320 - document running pulp-manage-db after installation.
Merge remote-tracking branch 'origin/mhrivnak-1138356' into tmp

Conflicts:
	docs/sphinx/user-guide/server.rst
Merge branch 'tmp' into 2.4-testing
Merge branch 'tmp' into 2.4-dev
Merge branch 'tmp' into 2.5-testing
Merge branch '2.4-testing' into 2.4-dev
Merge branch '2.4-dev' into 2.5-testing
Fixes a mistake in a unit test and removes an extra space in docs
Merge pull request #1192 from bmbouter/1149894

1149894 - Adds a get_parent_directory that gets it right with a trailing slash