test-dirstate: fix testcase handling in new tests

Summary:
`#testcases` was translated to `for testcase in ...`, which is subtly
different since the for loop does not clean up states. Insert `cd $TESTTMP`
to make sure `setconfig` sets the global config, instead of the repo one.

Reviewed By: singhsrb

Differential Revision: D16363261

fbshipit-source-id: ea20c758e9131268f9329b98759e7423d9f1aa87

tests/test-dirstate-completion-t.py

@@ -10,6 +10,8 @@ from testutil.dott import feature, sh, testtmp  # noqa: F401
 
 for testcase in ["v0", "v1", "v2"]:
 
+    sh % "cd $TESTTMP"
+
     if feature.check(["v0"]):
         sh % "setconfig 'format.dirstate=0'"
 

tests/test-dirstate-symlink-t.py

@@ -12,6 +12,8 @@ feature.require(["symlink"])
 
 for testcase in ["v0", "v1", "v2"]:
 
+    sh % "cd $TESTTMP"
+
     if feature.check(["v0"]):
         sh % "setconfig 'format.dirstate=0'"