Update error handling on sdbusplus calls

Error handling was added to the bus.call() routine,
which effectively deprecated the is_method_error()
check. Errors should now be handled in a try/catch
block.

Change-Id: I1dcbbaa91db443445ef6bb2f616bd37f06731d36
Signed-off-by: Anthony Wilson <wilsonan@us.ibm.com>
6 files changed