BaseTools: Refactor python except statements

Convert "except ... ," to "except ... as" to be compatible with python3.
Based on "futurize -f lib2to3.fixes.fix_except"

Contributed-under: TianoCore Contribution Agreement 1.1
Cc: Yonghong Zhu <yonghong.zhu@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Signed-off-by: Gary Lin <glin@suse.com>
Reviewed-by: Yonghong Zhu <yonghong.zhu@intel.com>

BaseTools/Source/Python/Ecc/MetaFileWorkspace/MetaDataTable.py

@@ -98,7 +98,7 @@ class Table(object):
         SqlCommand = """drop table IF EXISTS %s""" % self.Table
         try:
             self.Cur.execute(SqlCommand)
-        except Exception, e:
+        except Exception as e:
             print "An error occurred when Drop a table:", e.args[0]
 
     ## Get count