Let PackageListingAcl.get_pending_acl return all pending ACLs requests if not user is specified
Let get_pending_acl_user return all pending ACLs requests if not user is specified
Add a new extra API endpoint listing all the pending ACL requests
Add unit-tests for the new API endpoint listing the pending ACL requests
List the /api/pendingacls in the API documentation
More tests for /api/pendingacls in json restricted with a username that has no pending ACLs
Optimize the text output of the /api/pendingacls endpoint following @abadger 's advice

Signed-off-by: Pierre-Yves Chibon <pingou@pingoured.fr>
Adjust the unit-tests for the changes in the output generated by /api/pendingacls
Optimize the text output of /api/critpath to follow @abadger's advice
Let pending_acls be sorted using .sort instead or sorted()

.sort sorts in-place while sorted() creates a new list, which is not
something required here.
Merge pull request #64 from fedora-infra/pending_acl_api

Pending acl api