getAllExecutionsResults not implemented in python side api client

[rustyscottweber]

getAllExecutionsResults not implemented.

Function was recently added to the xml rpc web service.

https://github.com/TestLinkOpenSourceTRMS/testlink-code/pull/151/files?utf8=%E2%9C%93&diff=unified

However when attempting to call from the pythonic api.

c = testlink.TestlinkAPIClient(args.server, args.key)
c.getAllExecutionsResults()
Traceback (most recent call last):
  File "C:\Users\RWeber.OSS\.IntelliJIdea2018.1\config\plugins\python\helpers\pydev\_pydevd_bundle\pydevd_exec2.py", line 3, in Exec
    exec(exp, global_vars, local_vars)
  File "<input>", line 1, in <module>
AttributeError: 'TestlinkAPIClient' object has no attribute 'getAllExecutionsResults'

Method needs to be added to match it's peer.