tests: use regular expressions instead of helpers

tests/test-bookmarks-rebase.t

@@ -1,5 +1,3 b''
-  $ . $TESTDIR/helpers.sh
-
   $ echo "[extensions]" >> $HGRCPATH
   $ echo "rebase=" >> $HGRCPATH
   $ echo "bookmarks=" >> $HGRCPATH
@@ -38,8 +36,8 b' bookmark list'
 
 rebase
 
-  $ hg rebase -s two -d one 2>&1 | cleanrebase
-  saved backup bundle to 
+  $ hg rebase -s two -d one
+  saved backup bundle to .*
 
   $ hg log
   changeset:   3:9163974d1cb5

tests/test-bookmarks-strip.t

@@ -1,4 +1,3 b''
-  $ . $TESTDIR/helpers.sh
   $ echo "[extensions]" >> $HGRCPATH
   $ echo "bookmarks=" >> $HGRCPATH
   $ echo "mq=" >> $HGRCPATH
@@ -50,8 +49,8 b' bookmarks updated?'
 
 strip to revision 1
 
-  $ hg strip 1 | hidebackup
-  saved backup bundle to 
+  $ hg strip 1
+  saved backup bundle to .*
 
 list bookmarks
 

tests/test-mq.t

@@ -1,5 +1,3 b''
-  $ . $TESTDIR/helpers.sh
-
   $ checkundo()
   > {
   >     if [ -f .hg/store/undo ]; then
@@ -733,9 +731,9 b' strip'
   $ echo x>x
   $ hg ci -Ama
   adding x
-  $ hg strip tip | hidebackup
+  $ hg strip tip
   0 files updated, 0 files merged, 1 files removed, 0 files unresolved
-  saved backup bundle to 
+  saved backup bundle to .*
   $ hg unbundle .hg/strip-backup/*
   adding changesets
   adding manifests
@@ -750,14 +748,14 b' strip with local changes, should complai'
   1 files updated, 0 files merged, 0 files removed, 0 files unresolved
   $ echo y>y
   $ hg add y
-  $ hg strip tip | hidebackup
+  $ hg strip tip
   abort: local changes found
 
 --force strip with local changes
 
-  $ hg strip -f tip | hidebackup
+  $ hg strip -f tip
   0 files updated, 0 files merged, 1 files removed, 0 files unresolved
-  saved backup bundle to 
+  saved backup bundle to .*
 
 
 cd b; hg qrefresh
@@ -1110,9 +1108,9 b' strip again'
   date:        Thu Jan 01 00:00:00 1970 +0000
   summary:     add foo
   
-  $ hg strip 1 | hidebackup
+  $ hg strip 1
   1 files updated, 0 files merged, 0 files removed, 0 files unresolved
-  saved backup bundle to 
+  saved backup bundle to .*
   $ checkundo strip
   $ hg log
   changeset:   1:20cbbe65cff7