Rename art-run-test-asan to art-asan

This makes it consistent with all the other configurations.

Test: manual
Change-Id: I239642abac451fe9a2d9727d5a52760e3cdb96eb
diff --git a/test/testrunner/target_config.py b/test/testrunner/target_config.py
index 97d4509..6bdd758 100644
--- a/test/testrunner/target_config.py
+++ b/test/testrunner/target_config.py
@@ -324,7 +324,7 @@
             'SANITIZE_HOST' : 'address'
         }
    },
-   'art-run-test-asan': {
+   'art-asan': {
         'run-test' : ['--interpreter',
                       '--optimizing',
                       '--jit'],