Remove --kept-pack-only option and associated infrastructure

This option to pack-objects/rev-list was created to improve the -A and -a
options of repack.  It was found to be lacking in that it did not provide
the ability to differentiate between local and non-local kept packs, and
found to be unnecessary since objects residing in local kept packs can be
filtered out by the --honor-pack-keep option.

Signed-off-by: Brandon Casey <casey@nrlssc.navy.mil>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/revision.c b/revision.c
index 6d8ac46..50a5b5f 100644
--- a/revision.c
+++ b/revision.c
@@ -1062,10 +1062,6 @@
 		revs->edge_hint = 1;
 	} else if (!strcmp(arg, "--unpacked")) {
 		revs->unpacked = 1;
-		revs->kept_pack_only = 0;
-	} else if (!strcmp(arg, "--kept-pack-only")) {
-		revs->unpacked = 1;
-		revs->kept_pack_only = 1;
 	} else if (!prefixcmp(arg, "--unpacked=")) {
 		die("--unpacked=<packfile> no longer supported.");
 	} else if (!strcmp(arg, "-r")) {
@@ -1475,10 +1471,7 @@
 {
 	if (commit->object.flags & SHOWN)
 		return commit_ignore;
-	if (revs->unpacked &&
-	    (revs->kept_pack_only
-	     ? has_sha1_kept_pack(commit->object.sha1)
-	     : has_sha1_pack(commit->object.sha1)))
+	if (revs->unpacked && has_sha1_pack(commit->object.sha1))
 		return commit_ignore;
 	if (revs->show_all)
 		return commit_show;