Use git cache directory for Jiri cache

This is the default name for the Git cache managed by swarmbucket.

Change-Id: I22da6ea04d45e9feddccf0011dfdd2867a67d4a3
diff --git a/recipe_modules/jiri/api.py b/recipe_modules/jiri/api.py
index f967ee7..683e3dc 100644
--- a/recipe_modules/jiri/api.py
+++ b/recipe_modules/jiri/api.py
@@ -38,7 +38,7 @@
         return self._jiri_executable
 
     def init(self, dir=None, **kwargs):
-        cmd = [ 'init', '-cache', self.m.path['cache'].join('jiri') ]
+        cmd = [ 'init', '-cache', self.m.path['cache'].join('git') ]
         if dir:
             cmd.append(dir)
 
diff --git a/recipe_modules/jiri/example.expected/basic.json b/recipe_modules/jiri/example.expected/basic.json
index d2f5242..a3b7811 100644
--- a/recipe_modules/jiri/example.expected/basic.json
+++ b/recipe_modules/jiri/example.expected/basic.json
@@ -56,7 +56,7 @@
       "[START_DIR]/cipd/jiri/jiri",
       "init",
       "-cache",
-      "[CACHE]/jiri",
+      "[CACHE]/git",
       "dir"
     ],
     "name": "jiri init"