autotest-tests: Add timeout to network_3GDisableWhileConnecting.

network_3GDisableWhileConnecting had a timeout argument that wasn't used. This
resulted in the test getting stuck sometimes indefinitely. This CL threads the
timeout argument through the test.
It also removes the repeated timeout value from all control files, using a
default instead.

BUG=chromium:389628
TEST=(1) test_that network_3GDisableWhileDisconnecting passes.
     (2) It fails if you pass a very small timeout value in the control file.

Change-Id: I8c8ca357e827a268e8103b3ab269957374ab8036
Reviewed-on: https://chromium-review.googlesource.com/206016
Reviewed-by: Thieu Le <thieule@chromium.org>
Commit-Queue: Prathmesh Prabhu <pprabhu@chromium.org>
Tested-by: Prathmesh Prabhu <pprabhu@chromium.org>
(cherry picked from commit eb670a0649c8641ed88968563fd182cf904f1c34)
Reviewed-on: https://chromium-review.googlesource.com/210046
Reviewed-by: Prathmesh Prabhu <pprabhu@chromium.org>
13 files changed