Testsuite: Unset CVS_SERVER

The CVS_SERVER environment variable can cause some of the cvsimport tests
to fail. So unset this variable at the beginning of the test script.
Signed-off-by: NFabian Emmes <fabian.emmes@rwth-aachen.de>
Signed-off-by: NLars Noschinski <lars@public.noschinski.de>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

t/t9600-cvsimport.sh

@@ -5,6 +5,7 @@ test_description='git-cvsimport basic tests'
 
 CVSROOT=$(pwd)/cvsroot
 export CVSROOT
+unset CVS_SERVER
 # for clean cvsps cache
 HOME=$(pwd)
 export HOME