Tethering: Skip link local addresses when enabling NAT

Only one entry is allowed to be added to route table 60 for all
interface ipv6 link local addresses, so skip ipv6 link local
addresses on all interfaces when enabling NAT

Change-Id: Ibbe6c2bdae83586cdd38287089715f3433bbb91f
Signed-off-by: jiaguo <jiaguo@marvell.com>
Structure device not freed in error case

In case of an error in the call usb_device_get_fd()
the memory created by usb_open_device() is never
freed.

Added a call to usb_device_close in case of error to
release the allocated memory.

Change-Id: Iaa83674f000242d80604dd30c782236f7afd90c2
Fixed a possible infinite loop in JsonReader#skipValue()

Bug: https://code.google.com/p/android/issues/detail?id=65846

Change-Id: Idaa0e75fc5612550c4b9ccb9afa5535ea5b189df
Remove java.io.tmpdir assignment in AndroidRuntime.

This value is overridden by the framework anyway
(see ActivityThread.handleBindApplication). Besides,
it doesn't seem like a great idea to let tools clutter
/sdcard/ with temp files.

Change-Id: I26c710cbea7397f89e6103e54a73044a87da95b1