Remove super call in overloaded close()

Change Ia30058bc4752489107b998bd44d38c27901cfe63 introduced a super()
call after overloading the close() method in VerifiedHTTPSConnection.
However, the parent class httplib.HTTPConnection was definied using
the old-style class contructor so the super() call won't work. This
commit fixes that by removing the super() call and explicitly calling
the parent class's close() method.

Closes-Bug: #1273737

Change-Id: I17b86e67716b427866bc33ca3c15cb4e32ba6587
Merge "Remove super call in overloaded close()"