conman:  Get provisioning AP SSIDs from vendor IEs.

Provisioning network APs hide their SSIDs so as not to be visible to
users, instead putting their SSIDs in a vendor IE.  This commit
updates conman to read these SSIDs.

Change-Id: I1e9b4165d935c1ff22af7f06f8b4b03bb9c59d6d
3 files changed