bluez5: Update the bluetooth.conf 

In bluez5, Agent interface has been renamed from org.bluez.Agent
to org.bluez.Agent1. Reflect this change in bluetooth.conf to
allow sending of dbus messages to agent interface.

*Resolves no PIN prompt bug while pairing
JIRA: http://jira.alm.mentorg.com:8080/browse/SB-2041

*Resolves bluetooth keyboard connection problem.
JIRA: http://jira.alm.mentorg.com:8080/browse/SB-2180

Signed-off-by: Yasir-Khan <yasir_khan@mentor.com>