Minor fix to python table caching API.

Author: Michael Armbrust <[email protected]>

Closes #585 from marmbrus/pythonCacheTable and squashes the following commits:

7ec1f91 [Michael Armbrust] Minor fix to python table caching API.
(cherry picked from commit 497be3c)

Signed-off-by: Patrick Wendell <[email protected]>

Author: marmbrus

python/pyspark/sql.py

@@ -143,13 +143,13 @@ def table(self, tableName):
         """
         return SchemaRDD(self._ssql_ctx.table(tableName), self)
 
-    def cacheTable(tableName):
+    def cacheTable(self, tableName):
         """
         Caches the specified table in-memory.
         """
         self._ssql_ctx.cacheTable(tableName)
 
-    def uncacheTable(tableName):
+    def uncacheTable(self, tableName):
         """
         Removes the specified table from the in-memory cache.
         """