lambda + SNS enhancements (#1048)

* updates

- support lambda messages from SNS
- run lambda in docker container

* decode output

* populate timeout

* simplify

* whoops

* skeletons of cloudwatchlogs

* impl filter log streams

* fix logging

* PEP fixes

* PEP fixes

* fix reset

* fix reset

* add new endpoint

* fix region name

* add docker

* try to fix tests

* try to fix travis issue with boto

* fix escaping in urls

* fix environment variables

* fix PEP

* more pep

* switch back to precise

* another fix attempt

* fix typo

* fix lambda invoke

* fix more unittests

* work on getting this to work in new scheme

* fix py2

* fix error

* fix tests when running in server mode

* more lambda fixes

* try running with latest docker

adapted from aiodocker

* switch to docker python client

* pep fixes

* switch to docker volume

* fix unittest

* fix invoke from sns

* fix zip2tar

* add hack impl for get_function with zip

* try fix

* fix for py < 3.6

* add volume refcount

* try to fix travis

* docker test

* fix yaml

* try fix

* update endpoints

* fix

* another attempt

* try again

* fix recursive import

* refactor fix

* revert changes with better fix

* more reverts

* wait for service to come up

* add back detached mode

* sleep and add another exception type

* put this back for logging

* put back with note

* whoops :)

* docker in docker!

* fix invalid url

* hopefully last fix!

* fix lambda regions

* fix protocol

* travis!!!!

* just run lambda test for now

* use one print

* fix escaping

* another attempt

* yet another

* re-enable all tests

* fixes

* fix for py2

* revert change

* fix for py2.7

* fix output ordering

* remove this given there's a new unittest that covers it

* changes based on review

- add skeleton logs test file
- switch to docker image that matches test env
- fix mock_logs import

* add readme entry

wait_for.py

@@ -0,0 +1,31 @@
+import time
+
+try:
+    # py2
+    import urllib2 as urllib
+    from urllib2 import URLError
+    import socket
+    import httplib
+
+    EXCEPTIONS = (URLError, socket.error, httplib.BadStatusLine)
+except ImportError:
+    # py3
+    import urllib.request as urllib
+    from urllib.error import URLError
+
+    EXCEPTIONS = (URLError, ConnectionResetError)
+
+
+start_ts = time.time()
+print("Waiting for service to come up")
+while True:
+    try:
+        urllib.urlopen('http://localhost:5000/', timeout=1)
+        break
+    except EXCEPTIONS:
+        elapsed_s = time.time() - start_ts
+        if elapsed_s > 30:
+            raise
+
+        print('.')
+        time.sleep(1)