test-strip: make test compatible with chg

The test was using reposetup which had the logic for stripping
commits. This leads to a situation where if the reposetup was called twice for
an extension (which can happen with chg running), the stripped node would not
be found the second time. Therefore, this commit changes the test to put the
stripping logic inside commands instead of the reposetup. This ensures that the
stripping logic is invoked only when the command is invoked and thus, avoids
any problems.

Test Plan:
Ran the test 'test-strip.t' with and without the '--chg' option.

Differential Revision: https://phab.mercurial-scm.org/D928

tests/test-strip.t

@@ -962,8 +962,11 b' Use delayedstrip to strip inside a trans'
   $ echo 3 >> I
   $ cat > $TESTTMP/delayedstrip.py <<EOF
   > from __future__ import absolute_import
-  > from mercurial import commands, repair
-  > def reposetup(ui, repo):
+  > from mercurial import commands, registrar, repair
+  > cmdtable = {}
+  > command = registrar.command(cmdtable)
+  > @command('testdelayedstrip')
+  > def testdelayedstrip(ui, repo):
   >     def getnodes(expr):
   >         return [repo.changelog.node(r) for r in repo.revs(expr)]
   >     with repo.wlock():
@@ -973,10 +976,10 b' Use delayedstrip to strip inside a trans'
   >                 repair.delayedstrip(ui, repo, getnodes('G+H+Z'), 'I')
   >                 commands.commit(ui, repo, message='J', date='0 0')
   > EOF
-  $ hg log -r . -T '\n' --config extensions.t=$TESTTMP/delayedstrip.py
+  $ hg testdelayedstrip --config extensions.t=$TESTTMP/delayedstrip.py
   warning: orphaned descendants detected, not stripping 08ebfeb61bac, 112478962961, 7fb047a69f22
   saved backup bundle to $TESTTMP/delayedstrip/.hg/strip-backup/f585351a92f8-17475721-I.hg (glob)
-  
+
   $ hg log -G -T '{rev}:{node|short} {desc}' -r 'sort(all(), topo)'
   @  6:2f2d51af6205 J
   |
@@ -1009,8 +1012,11 b' Test high-level scmutil.cleanupnodes API'
   $ cp -R . ../scmutilcleanup.obsstore
 
   $ cat > $TESTTMP/scmutilcleanup.py <<EOF
-  > from mercurial import scmutil
-  > def reposetup(ui, repo):
+  > from mercurial import registrar, scmutil
+  > cmdtable = {}
+  > command = registrar.command(cmdtable)
+  > @command('testnodescleanup')
+  > def testnodescleanup(ui, repo):
   >     def nodes(expr):
   >         return [repo.changelog.node(r) for r in repo.revs(expr)]
   >     def node(expr):
@@ -1024,10 +1030,10 b' Test high-level scmutil.cleanupnodes API'
   >                 scmutil.cleanupnodes(repo, mapping, 'replace')
   >                 scmutil.cleanupnodes(repo, nodes('((B::)+I+Z)-D2'), 'replace')
   > EOF
-  $ hg log -r . -T '\n' --config extensions.t=$TESTTMP/scmutilcleanup.py
+  $ hg testnodescleanup --config extensions.t=$TESTTMP/scmutilcleanup.py
   warning: orphaned descendants detected, not stripping 112478962961, 1fc8102cda62, 26805aba1e60
   saved backup bundle to $TESTTMP/scmutilcleanup/.hg/strip-backup/f585351a92f8-73fb7c03-replace.hg (glob)
-  
+
   $ hg log -G -T '{rev}:{node|short} {desc} {bookmarks}' -r 'sort(all(), topo)'
   o  8:1473d4b996d1 G2 b-F@divergent3 b-G
   |
@@ -1068,8 +1074,8 b' we have reusable code here'
   > stabilization.track-operation=1
   > EOF
 
-  $ hg log -r . -T '\n' --config extensions.t=$TESTTMP/scmutilcleanup.py
-  
+  $ hg testnodescleanup --config extensions.t=$TESTTMP/scmutilcleanup.py
+
   $ rm .hg/localtags
   $ hg log -G -T '{rev}:{node|short} {desc} {bookmarks}' -r 'sort(all(), topo)'
   o  12:1473d4b996d1 G2 b-F@divergent3 b-G