resend discovery primary service ATT request with timeout

This is to work around the problem with iphone.
The iphone didn't respond with our first ATT request
(read By group type Request for for primary service).
the clockwork/phone host keep waiting for ATT response until disconnection
from iphone due to timeout.
The workaround is to
resend discovery primary service before disconnection from remote device
when response timeout happen.
This workaround will be better for us to interop with remote BLE device.

bug:12895830
Change-Id: I236af8eca9790f2dae7098061c74cec55348ca6d