Extend fapi2::buffer parametric interfaces
Extend fapi2::buffer parametric interfaces

  Add fapi2::buffer<T>::clearBit(bit_to_clear)
  Add extract/insert(<parameters>)

Change-Id: I8dc00b6da68b22cd7b346cc1da56d33b94aec5b7
Reviewed-on: http://gfw160.aus.stglabs.ibm.com:8080/gerrit/17542
Tested-by: Jenkins Server
Reviewed-by: Matt K. Light <19ba8ed73a0b3c376c81fced381f1ac0f483b7c2@us.ibm.com>
Reviewed-by: Thi N. Tran <25a2bca7ae5a8ea03be09ca8d282480c08c13052@us.ibm.com>
Reviewed-by: Brian Silver <af0eed78d989d9597decc8b92fa6db01ef8b58e0@us.ibm.com>
Tested-by: Brian Silver <af0eed78d989d9597decc8b92fa6db01ef8b58e0@us.ibm.com>

Over-enthusiastic/hostboot,Over-enthusiastic/hostboot,Over-enthusiastic/hostboot,Over-enthusiastic/hostboot,Over-enthusiastic/hostboot