Increase time between wifi stop and wifi start: set to 2 minutes

http://b/issue?id=5629901

Change on state validation:
  - When network state is broadcast in other network information,
    the test activity will record the state change which cause false
    alarm in the test.

Change-Id: I8bd1e8c04ab97116f3a02ccc5543f34a7e651cda