Wifi: Fix for connection failure between third client and GC.

When third device sends a connection request to the group client, the
existing connection is terminating and also the ongoing connection not
successful.Currently as there is  no use case where third device is
connecting to GC,and the existing onnection getting terminated.This
is addressed by ignoring the new connection request from third client
to GC and the existing connection is intact.
CRs-Fixed: 467049

Change-Id: I784c38b9a4ca0c60b188b9697e3b4af4d09053cc
wifi: Fix for connection between GO and p2p device

When GO sends an invitation request to the p2p device without
persistent profile, GO gets an invitation result=8 which means
unknown group, when GO receives invitation result 8, its tries
to remove persistent profile of the client but it will not be able
find the profile so it does continue with sending the invitation
so the connection fails. To address this, ignore if there are no
persistent profiles found for the client and continue with sending
the Invitation request to the client to make connection succesful
connection. As GO has single profile saved unlike client which
saves multiple profiles of GO.

CRs-Fixed: 511282
Change-Id: I78f54d4bb2f0d603bc2170ec2c3ef55a91050236
Wifi: Enable Ad-Hoc (IBSS) network configuration

This adds two public but hidden variables to WifiConfiguration: isIBSS and
frequency. These are used for configuring IBSS mode.

WifiConfigStore is exended to get and set these variables to wpa_supplicant
(via WifiNative).

Change-Id: Iab02c3d738c05c2de036350ea77b78789213e357
Wifi: Add IBSS supported method

Add method isIbssSupported() to WifiManager and related classes to query wether
the driver supports IBSS mode. The query is answered by wpa_supplicants new
command "get_capability modes".

It will only return a correct result after WIFI_STATE_ENABLED has been
reached.

Change-Id: I93aa2fdff94cd897c91ec3beb7e58940d1de7b72

Conflicts:
	wifi/java/android/net/wifi/WifiNative.java
Wifi: Get the list of supported channels

Get the list of supported channels/frequencies from wpa_supplicant and provide
them thru WifiManager.getSupportedChannels();

One channel is represented thru the class WifiChannel which includes channel
number, frequency in MHz and a flag if IBSS mode is allowed on this channel.

Like isIbssSupported() we can only expect a result after WIFI_STATE_ENABLED has
been reached.

Change-Id: I9fc34642b9a0047f6871b180a3a7a69d47b7e2ff