Update git submodules

* Update trusty/user/base from branch 'master'
  to 15a3284db5179b585d287039993e09df17be2255
  - Add initial support for gtest
    
    Bug: 138738352
    Change-Id: Ifa8b7eabe3faf5cea2c2bf6bce41fd41075d2be8
    
1 file changed