Fix exception when sending multi-page SMS with Turkish characters.

 - Precondition: config_sms_enabled_single_shift_tables is configured as
   1 (Turkish) in frameworks/base/core/res/res/values/config.xml

 - Cause: There is no consideration for National Language Shift Tables in
   SmsMessage::fragmentText function.

 - Solution: The header length is calculated properly according to
   National Language Shift Table

 - modified to add test cases and fix calculation bug (jhamby@google.com)

Bug: 5553544
Change-Id: I9eaefbbd6b3d75f8c41cbf9d0cb03a701cfa1cb3