Added openpower util file support

Created common file to keep all the common util functions.

In this commit
 - added getService function to get d-bus service for given
   interface.
 - updated create_pel.cpp to start using common util interface.
 - Moved formatting library to common build dependency for
   both meson and automake.

Tested: Manually verified.

Signed-off-by: Jayanth Othayoth <ojayanth@in.ibm.com>
Change-Id: I39a642710c0476e81fae020eb3b4216ca8ce9ad5
7 files changed