config: rename stabilization.bundle-obsmarker

We want to get rid of stabilization.* configuration, back out to the old
configuration 'evolution.bundle-obsmarker'.

Differential Revision: https://phab.mercurial-scm.org/D1152

tests/test-obsolete-bundle-strip.t

@@ -18,7 +18,7 b' Config setup'
   > evolution=true
   > 
   > # include obsmarkers in bundle
-  > stabilization.bundle-obsmarker = yes
+  > evolution.bundle-obsmarker = yes
   > 
   > [extensions]
   > # needed for some tests

tests/test-obsolete-changeset-exchange.t

@@ -88,7 +88,7 b' check that bundle is not affected'
 
 check-that bundle can contain markers:
 
-  $ hg bundle --hidden --rev f89bcc95eba5 --base "f89bcc95eba5^" ../f89bcc95eba5-obs.hg --config experimental.stabilization.bundle-obsmarker=1
+  $ hg bundle --hidden --rev f89bcc95eba5 --base "f89bcc95eba5^" ../f89bcc95eba5-obs.hg --config experimental.evolution.bundle-obsmarker=1
   1 changesets found
   $ hg debugbundle ../f89bcc95eba5.hg
   Stream params: {Compression: BZ}