t910*: s/repo-config/config/g; poke around possible race conditions

Some of the repo-config => config renaming missed the git-svn
tests; so I'm just renaming them to be consisten with the
rest of the modern git.

Also, some of the newer tests didn't have 'poke' in them
to workaround race conditions on fast machines.  This adds
places where they can _possibly_ occur; but I don't have
fast enough hardware to trigger them.

Signed-off-by: Eric Wong <normalperson@yhbt.net>

t/t9104-git-svn-follow-parent.sh

@@ -39,10 +39,10 @@ test_expect_success 'init and fetch a moved directory' "
 	"
 
 test_expect_success 'init and fetch from one svn-remote' "
-        git-repo-config svn-remote.svn.url $svnrepo &&
-        git-repo-config --add svn-remote.svn.fetch \
+        git-config svn-remote.svn.url $svnrepo &&
+        git-config --add svn-remote.svn.fetch \
           trunk:refs/remotes/svn/trunk &&
-        git-repo-config --add svn-remote.svn.fetch \
+        git-config --add svn-remote.svn.fetch \
           thunk:refs/remotes/svn/thunk &&
         git-svn fetch -i svn/thunk &&
 	test \"\`git-rev-parse --verify refs/remotes/svn/trunk\`\" \
@@ -54,7 +54,7 @@ test_expect_success 'init and fetch from one svn-remote' "
 test_expect_success 'follow deleted parent' "
         svn cp -m 'resurrecting trunk as junk' \
                -r2 $svnrepo/trunk $svnrepo/junk &&
-        git-repo-config --add svn-remote.svn.fetch \
+        git-config --add svn-remote.svn.fetch \
           junk:refs/remotes/svn/junk &&
         git-svn fetch -i svn/thunk &&
         git-svn fetch -i svn/junk &&
@@ -124,6 +124,7 @@ test_expect_success 'follow-parent avoids deleting relevant info' "
 	  svn mv t native/t &&
 	  for i in a b c; do svn mv \$i.pm native/\$i.pm; done &&
 	  echo z >> native/t/c.t &&
+	  poke native/t/c.t &&
 	  svn commit -m 'reorg test' &&
 	cd .. &&
 	git-svn init -i r9270-t \