Get rid of sessionId (appium#383)

Author: KazuCocoa

test/unit/webdriver/device/activities_test.py

@@ -34,7 +34,6 @@ def test_start_activity(self):
         driver.start_activity('com.example.myapp', '.ExampleActivity')
 
         d = get_httpretty_request_body(httpretty.last_request())
-        assert d['sessionId'] == '1234567890'
         assert d['appPackage'] == 'com.example.myapp'
         assert d['appActivity'] == '.ExampleActivity'
 
@@ -58,7 +57,6 @@ def test_start_activity_with_opts(self):
         )
 
         d = get_httpretty_request_body(httpretty.last_request())
-        assert d['sessionId'] == '1234567890'
         assert d['appPackage'] == 'com.example.myapp'
         assert d['appActivity'] == '.ExampleActivity'
         assert d['appWaitPackage'] == 'com.example.waitapp'

test/unit/webdriver/device/lock_test.py

@@ -48,7 +48,6 @@ def test_lock_no_args(self):
 
         d = get_httpretty_request_body(httpretty.last_request())
         assert len(d.keys()) == 1
-        assert d['sessionId'] == '1234567890'
 
     @httpretty.activate
     def test_islocked_false(self):