refs: resolve conflict between local/remote repos

Add the functionality to use the same name for refs in local and remote
repos. This helps users keep track of local refs of remote origin, much
like local and remote git branches.

Previously, when a local ref is specified, resolve_refspec would fall
back to searching through remote repos if the ref is not found locally.
This function now takes an extra flag to specify whether it should
search through remote repos. Additionally, ostree_repo_resove_rev_ext
was added to call resolve_refspec with fallback_remote being false, so
refs --create would no longer complain when trying to create a local
ref of the same name as a remote one.

Fix remote repo parsing not being handled correctly on refs --create.

Closes: #363
Approved by: jlebon

apidoc/ostree-sections.txt

@@ -300,6 +300,7 @@ ostree_repo_write_content_trusted
 ostree_repo_write_content_async
 ostree_repo_write_content_finish
 ostree_repo_resolve_rev
+ostree_repo_resolve_rev_ext
 ostree_repo_list_refs
 ostree_repo_list_refs_ext
 ostree_repo_remote_list_refs