lib: Define an alias OSTREE_REPO_MODE_ARCHIVE

For the old `OSTREE_REPO_MODE_ARCHIVE_Z2`.  Use it mostly tree
wide except for the repo finder tests (to avoid conflicting with
some outstanding PRs).

Just noted another user coming in some of those tests and wanted to do a
cleanup.

Closes: #1209
Approved by: jlebon

src/libostree/ostree-core.h

@@ -180,7 +180,8 @@ typedef enum {
 /**
  * OstreeRepoMode:
  * @OSTREE_REPO_MODE_BARE: Files are stored as themselves; checkouts are hardlinks; can only be written as root
- * @OSTREE_REPO_MODE_ARCHIVE_Z2: Files are compressed, should be owned by non-root.  Can be served via HTTP
+ * @OSTREE_REPO_MODE_ARCHIVE: Files are compressed, should be owned by non-root.  Can be served via HTTP.  Since: 2017.12
+ * @OSTREE_REPO_MODE_ARCHIVE_Z2: Legacy alias for `OSTREE_REPO_MODE_ARCHIVE`
  * @OSTREE_REPO_MODE_BARE_USER: Files are stored as themselves, except ownership; can be written by user. Hardlinks work only in user checkouts.
  * @OSTREE_REPO_MODE_BARE_USER_ONLY: Same as BARE_USER, but all metadata is not stored, so it can only be used for user checkouts. Does not need xattrs.
  *
@@ -189,7 +190,8 @@ typedef enum {
  */
 typedef enum {
   OSTREE_REPO_MODE_BARE,
-  OSTREE_REPO_MODE_ARCHIVE_Z2,
+  OSTREE_REPO_MODE_ARCHIVE,
+  OSTREE_REPO_MODE_ARCHIVE_Z2 = OSTREE_REPO_MODE_ARCHIVE,
   OSTREE_REPO_MODE_BARE_USER,
   OSTREE_REPO_MODE_BARE_USER_ONLY,
 } OstreeRepoMode;