Fix run_all_test script to avoid git-cl variable clashes.
Fix run_all_test script to avoid git-cl variable clashes.

A recent update to git-cl seems to use the same variable
SCRIPT, etc...

After running run_all_tests, the git-cl script won't work until you unset
the variables or close your shell.

Unsetting the variable is enough, but it's safer to use a new name in
case the script crashes.

R=chrisha@chromium.org, chrisha

BUG=

Review URL: https://codereview.appspot.com/74770043

git-svn-id: db59699583a60be9a535cd09cdc9132301867226@2072 15e8cca8-e42c-11de-a347-f34a4f72eb7d

sebmarchand/syzygy,sebmarchand/syzygy,pombreda/syzygy,ericmckean/syzygy,pombreda/syzygy,supriyantomaftuh/syzygy,ericmckean/syzygy,wangming28/syzygy,ericmckean/syzygy,ericmckean/syzygy,supriyantomaftuh/syzygy,wangming28/syzygy,supriyantomaftuh/syzygy,Eloston/syzygy,google/syzygy,pombreda/syzygy,google/syzygy,sebmarchand/syzygy,sebmarchand/syzygy,supriyantomaftuh/syzygy,sebmarchand/syzygy,Eloston/syzygy,ericmckean/syzygy,wangming28/syzygy,wangming28/syzygy,pombreda/syzygy,google/syzygy,pombreda/syzygy,google/syzygy