tree d2dd0d6acd56c065bbf1215a6e673ddc46776097
parent 63b4f6f5db4d5ea0114d195a0f33970e7070f21b
author Jacky Cheung <jackyc@google.com> 1476996921 -0700
committer Jacky Cheung <jackyc@google.com> 1476997144 -0700

Gradually increase the level of authentication on failed GATT operations.

When lower layer returns insufficient authentication or insufficient
encryption on various GATT operations, gradually retry with increased
authentication level first to AUTHENTICATION_NO_MITM, then
AUTHENTICATION_MITM.

Test: ported from internal branch.

Change-Id: I6bcc4198ca493b7900ddd166a81d30cde896fa86