config: use 'experimental.evolution.exchange'

Extract 'experimental.evolution' = exchange as
'experimental.evolution.exchange'.

We keep the new option in the 'experimental.evolution' namespace in order to
stay coherent with other options ('experimental.evolution.bundle-obsmarker'
and 'experimental.evolution.track-operation') ease the renaming as possibly
'evolution.exchange'.

Differential Revision: https://phab.mercurial-scm.org/D1151

tests/test-bookmarks-pushpull.t

@@ -6,8 +6,8 b''
   > [phases]
   > publish=False
   > [experimental]
-  > evolution=exchange
   > evolution.createmarkers=True
+  > evolution.exchange=True
   > EOF
 
   $ TESTHOOK='hooks.txnclose-bookmark.test=echo "test-hook-bookmark: $HG_BOOKMARK:  $HG_OLDNODE -> $HG_NODE"'

tests/test-bundle2-exchange.t

@@ -15,8 +15,8 b' enable obsolescence'
 
   $ cat >> $HGRCPATH << EOF
   > [experimental]
-  > evolution=exchange
   > evolution.createmarkers=True
+  > evolution.exchange=True
   > bundle2-output-capture=True
   > [ui]
   > ssh="$PYTHON" "$TESTDIR/dummyssh"

tests/test-obsolete-bounds-checking.t

@@ -7,8 +7,8 b' Create a repo, set the username to somet'
   > [extensions]
   > amend =
   > [experimental]
-  > stabilization=exchange
   > evolution.createmarkers=True
+  > evolution.exchange=True
   > EOF
   $ hg init tmpa
   $ cd tmpa

tests/test-obsolete.t

@@ -907,7 +907,7 b' Checking _enable=False warning if obsole'
 reenable for later test
 
   $ echo '[experimental]' >> $HGRCPATH
-  $ echo "evolution=exchange" >> $HGRCPATH
+  $ echo "evolution.exchange=True" >> $HGRCPATH
   $ echo "evolution.createmarkers=True" >> $HGRCPATH
 
   $ rm hg.pid access.log errors.log

tests/test-tag.t

@@ -415,7 +415,7 b' issue5539: pruned tags do not appear in '
 
   $ cat >> $HGRCPATH << EOF
   > [experimental]
-  > evolution=exchange
+  > evolution.exchange = True
   > evolution.createmarkers=True
   > EOF
   $ hg up e4d483960b9b --quiet