changegroup: add a option to create bundle with full snapshot only

This is easy to implement now and can be useful for benchmarking.

mercurial/changegroup.py

@@ -698,7 +698,7 b' def deltagroup(repo, store, nodes, ischa'
                                         total=len(nodes))
 
     configtarget = repo.ui.config('devel', 'bundle.delta')
-    if configtarget not in ('', 'p1'):
+    if configtarget not in ('', 'p1', 'full'):
         msg = _("""config "devel.bundle.delta" as unknown value: %s""")
         repo.ui.warn(msg % configtarget)
 
@@ -707,6 +707,8 b' def deltagroup(repo, store, nodes, ischa'
         deltamode = repository.CG_DELTAMODE_PREV
     elif configtarget == 'p1':
         deltamode = repository.CG_DELTAMODE_P1
+    elif configtarget == 'full':
+        deltamode = repository.CG_DELTAMODE_FULL
 
     revisions = store.emitrevisions(
         nodes,

tests/test-bundle.t

@@ -905,3 +905,7 b' Test the option that create slim bundle'
 
   $ hg bundle -a --config devel.bundle.delta=p1 ./slim.hg
   3 changesets found
+
+Test the option that create and no-delta's bundle
+  $ hg bundle -a --config devel.bundle.delta=full ./full.hg
+  3 changesets found