Contacts InCall metrics test

-added espresso & uiautomator for UI automation
-added test cases for metrics
    -INAPP_NUDGE_CONTACTS_TAB_LOGIN
    -DIRECTORY_SEARCH (from contacts tab)
    -CONTACTS_MANUAL_MERGED
    -CONTACTS_AUTO_MERGED
    -INVITES_SENT
    -DIRECTORY_SEARCH
    -INAPP_NUDGE_CONTACTS_LOGIN
    -INAPP_NUDGE_CONTACTS_INSTALL

Change-Id: I86e5827b19ed4f313d55902198d5f3ccb25b20e8