Add tf contrib dep to tradefed-all.

Bug: 36556899
Test: Built and saw jar in out folder and in zip.
built aosp-master/sdk successfully: https://android-build.googleplex.com/builds/view-workplan?viewType=Table&workplanId=L74200000058974958&nodeType=Trybot

$ unzip -l tradefed.zip
Archive:  tradefed.zip
  Length      Date    Time    Name
---------  ---------- -----   ----
  3949595  2017-04-28 15:30   tradefed.jar
   674016  2017-04-28 15:30   tradefed-tests.jar
   414546  2017-04-28 15:30   tf-prod-tests.jar
   453406  2017-04-28 15:30   emmalib.jar
  2759756  2017-04-28 15:30   loganalysis.jar
   609993  2017-04-28 15:30   loganalysis-tests.jar
  2543719  2017-04-28 15:30   tf-remote-client.jar
     1510  2017-04-28 15:30   tradefed-contrib.jar
     2068  2017-04-28 15:30   tf-contrib-prod-tests.jar
     8053  2017-04-28 15:30   TradeFedUiTestApp.apk
     6076  2017-04-28 15:30   TradeFedTestApp.apk
     9133  2017-04-28 15:30   DeviceSetupUtil.apk
     1186  2017-04-28 15:30   tradefed.sh
     2981  2017-04-28 15:30   tradefed_win.bat
     2907  2017-04-28 15:30   script_help.sh
     1217  2017-04-28 15:30   verify.sh
---------                     -------
 11440162                     16 files
Change-Id: I12d86aaee5d7cedac2849f69e45b9a8a5a8ac94d
1 file changed