tests: fix inadvertent use of existing test repository

tests/test-push-warn

@@ -125,19 +125,19 b' hg push -r 10 -r 11 ../f; echo $?'
 
 echo % checking prepush logic does not allow silently pushing multiple new heads
 cd ..
-hg init g
-echo init > g/init
-hg -R g ci -Am init
-echo a > g/a
-hg -R g ci -Am a
-hg clone g h
-hg -R g up 0
-echo b > g/b
-hg -R g ci -Am b
+hg init h
+echo init > h/init
+hg -R h ci -Am init
+echo a > h/a
+hg -R h ci -Am a
+hg clone h i
 hg -R h up 0
-echo c > h/c
-hg -R h ci -Am c
-hg -R h push g
+echo b > h/b
+hg -R h ci -Am b
+hg -R i up 0
+echo c > i/c
+hg -R i ci -Am c
+hg -R i push h
 echo
 
 exit 0

tests/test-push-warn.out

@@ -125,18 +125,17 b' adding file changes'
 added 2 changesets with 2 changes to 1 files
 0
 % checking prepush logic does not allow silently pushing multiple new heads
-abort: repository g already exists!
 adding init
 adding a
 updating working directory
-3 files updated, 0 files merged, 0 files removed, 0 files unresolved
-1 files updated, 0 files merged, 2 files removed, 0 files unresolved
+2 files updated, 0 files merged, 0 files removed, 0 files unresolved
+0 files updated, 0 files merged, 1 files removed, 0 files unresolved
 adding b
 created new head
-1 files updated, 0 files merged, 2 files removed, 0 files unresolved
+0 files updated, 0 files merged, 1 files removed, 0 files unresolved
 adding c
 created new head
-pushing to g
+pushing to h
 searching for changes
 abort: push creates new remote heads!
 (did you forget to merge? use push -f to force)