git.get_upstream_remote: add fallback code path (MR 2429)

When running some commands like "pmbootstrap chroot" or even
"pmbootstrap work_migrate", pmbootstrap will attempt to read the
pmaports.cfg from origin/master *before* doing the work dir migration.

In order to do this, the "get_upstream_remote" function tries to find
the upstream remote by URL. Let it search with the outdated URLs too, so
this doesn't fail right before migrating to the new URLs.

(cherry picked from commit a6d34d66)

pmb/helpers/git.py

@@ -103,6 +103,15 @@ def get_upstream_remote(args, name_repo):
     for line in lines:
         if url in line:
             return line.split("\t", 1)[0]
+
+    # Fallback to old URLs, in case the migration was not done yet
+    if name_repo == "pmaports":
+        urls_outdated = OUTDATED_GIT_REMOTES_HTTP
+        for line in lines:
+            if any(u in line.lower() for u in urls_outdated):
+                logging.warning("WARNING: pmaports has an outdated remote URL")
+                return line.split("\t", 1)[0]
+
     raise RuntimeError("{}: could not find remote name for URL '{}' in git"
                        " repository: {}".format(name_repo, url, path))