Clean up scan handling

Remove obsolete active/passive scan handling - drivers always
do active scan.

Also, remove AP_SCAN hack for preventing connections and use
the TYPE=ONLY scan.

Bug: 8158647
Change-Id: I8f70e19219ad789b7501a40529bcd6b6524739e8

Conflicts:
	services/java/com/android/server/wifi/WifiService.java
	wifi/java/android/net/wifi/WifiStateMachine.java
framework/base: Handle ASSOC-REJECT events

Disable current network and enable other saved networks(if any)
once number of ASSOC-REJECTs on an attempt to connect to a corresponding
network exceeds the threshold.
CRs-fixed: 484247

Change-Id: I59ca5b7bcb2cf8d205556feaac5871260a3fd8ec
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
When wifi wants ASCII lowercasing, it needs to ask for it.

http://elliotth.blogspot.com/2012/01/beware-convenience-methods.html

Bug: https://code.google.com/p/android/issues/detail?id=58359
Change-Id: Ibf25d0bbc76015cf8353ec01ab2b743cbc2bde67

Conflicts:

	wifi/java/android/net/wifi/WifiStateMachine.java

If frameworks wants ASCII casing, it should explicity ask for it.

http://elliotth.blogspot.com/2012/01/beware-convenience-methods.html

Bug: https://code.google.com/p/android/issues/detail?id=58359
Change-Id: Iaab02e718a7be7bda22e626dca05d79bfd2a8fc4

If graphics wants ASCII lowercasing, it needs to ask for it.

http://elliotth.blogspot.com/2012/01/beware-convenience-methods.html

Bug: https://code.google.com/p/android/issues/detail?id=58359
Change-Id: I13c106985302335dbb15bb9176d35ec6b4546d4e

If media wants ASCII lowercasing, it needs to ask for it.

http://elliotth.blogspot.com/2012/01/beware-convenience-methods.html

Use toLowerCase(Locale.ROOT) if you want ASCII for machine consumption,
and use toLowerCase(Locale.getDefault()) if you want the user's locale's
casing rules for human consumption.

Bug: https://code.google.com/p/android/issues/detail?id=58359
Change-Id: Id9005a17e34217a81bef3b40031b9e2e6272f45d

Conflicts:
	wifi/java/android/net/wifi/WifiStateMachine.java