core: Rename local-clone to pull-local

Also change it to copy selective refs, rather than enumerating
all objects.

tests/t0000-basic.sh

@@ -132,8 +132,8 @@ echo "ok metadata content"
 cd ${test_tmpdir}
 mkdir repo2
 ostree --repo=repo2 init
-$OSTREE local-clone repo2
-echo "ok local clone"
+ostree --repo=repo2 pull-local repo
+echo "ok pull-local"
 
 cd ${test_tmpdir}
 ostree --repo=repo2 checkout test2 test2-checkout-from-local-clone

tests/t0001-archive.sh

@@ -39,7 +39,7 @@ echo "ok content"
 cd ${test_tmpdir}
 mkdir repo2
 ostree --repo=repo2 init
-$OSTREE local-clone repo2
+ostree --repo=repo2 pull-local repo
 echo "ok local clone"
 
 cd ${test_tmpdir}