obsolete: rename `allmarkers` to `getmarkers`

This function is going to gain a "nodes" argument to filter the markers to the
ones relevant to <nodes> only.

mercurial/commands.py

@@ -2363,7 +2363,7 b' def debugobsolete(ui, repo, precursor=No'
         finally:
             l.release()
     else:
-        for m in obsolete.allmarkers(repo):
+        for m in obsolete.getmarkers(repo):
             cmdutil.showmarker(ui, m)
 
 @command('debugpathcomplete',

mercurial/obsolete.py

@@ -494,8 +494,8 b' def pushmarker(repo, key, old, new):'
     finally:
         lock.release()
 
-def allmarkers(repo):
-    """all obsolete markers known in a repository"""
+def getmarkers(repo):
+    """returns markers known in a repository"""
     for markerdata in repo.obsstore:
         yield marker(repo, markerdata)