tests: remove all remaining usage of experimental.bundle2-exp

The only remaining usage of the experimental config were enforcing bundle2 on.
These are very old remains of when bundle2 was off by default. This was also
useful to highlight the fact that this was a bundle2 run and that a bundle1 one
was nearby. However, we want a future developer working on bundle3 to notice
possible output/behavior change on these tests and take them in account.  So we
do not enforce bundle2 for these runs. We leave a comment around to make sure
dev still notice the bundle1 version.

tests/test-bookmarks-pushpull.t

@@ -822,7 +822,7 b' Local push'
 Using ssh
 ---------
 
-  $ hg push -B @ ssh --config experimental.bundle2-exp=True
+  $ hg push -B @ ssh # bundle2+
   pushing to ssh://user@dummy/issue4455-dest
   searching for changes
   no changes found
@@ -845,7 +845,7 b' Using ssh'
 Using http
 ----------
 
-  $ hg push -B @ http --config experimental.bundle2-exp=True
+  $ hg push -B @ http # bundle2+
   pushing to http://localhost:$HGPORT/
   searching for changes
   no changes found

tests/test-obsolete.t

@@ -650,7 +650,7 b' List of both'
 Test the debug output for exchange
 ----------------------------------
 
-  $ hg pull ../tmpb --config 'experimental.obsmarkers-exchange-debug=True' --config 'experimental.bundle2-exp=True'
+  $ hg pull ../tmpb --config 'experimental.obsmarkers-exchange-debug=True' # bundle2
   pulling from ../tmpb
   searching for changes
   no changes found

tests/test-phases-exchange.t

@@ -1041,7 +1041,7 b' same over the wire'
   $ cat ../beta.pid >> $DAEMON_PIDS
   $ cd ../gamma
 
-  $ hg pull http://localhost:$HGPORT/ --config experimental.bundle2-exp=True
+  $ hg pull http://localhost:$HGPORT/ # bundle2+
   pulling from http://localhost:$HGPORT/
   searching for changes
   no changes found

tests/test-pull-http.t

@@ -48,7 +48,7 b' expect error, cloning not allowed'
   $ echo 'allowpull = false' >> .hg/hgrc
   $ hg serve -p $HGPORT -d --pid-file=hg.pid -E errors.log
   $ cat hg.pid >> $DAEMON_PIDS
-  $ hg clone http://localhost:$HGPORT/ test4 --config experimental.bundle2-exp=True
+  $ hg clone http://localhost:$HGPORT/ test4 # bundle2+
   requesting all changes
   abort: authorization failed
   [255]

tests/test-push-hook-lock.t

@@ -38,7 +38,7 b''
 
   $ hg --cwd 1 --config extensions.strip= strip tip -q
   $ hg --cwd 2 --config extensions.strip= strip tip -q
-  $ hg --cwd 3 push ../2 --config experimental.bundle2-exp=True
+  $ hg --cwd 3 push ../2 # bundle2+
   pushing to ../2
   searching for changes
   adding changesets

tests/test-subrepo.t

@@ -1539,7 +1539,7 b' Courtesy phases synchronisation to publi'
   [1]
 # clean the push cache
   $ rm s/.hg/cache/storehash/*
-  $ hg push --config experimental.bundle2-exp=True
+  $ hg push # bundle2+
   pushing to $TESTTMP/issue3781-dest (glob)
   pushing subrepo s to $TESTTMP/issue3781-dest/s
   searching for changes