Upgrade dependencies

[Kami]

Various dependencies upgrades again to get the latest changes and bug fixes:

• pyyaml,
• requests
• appscheduler
• gitpython
• paramiko
• mongoengine
• tooz

[LindsayHill]

@Kami looks like you've broken the githubwebhooksensor (https://github.com/StackStorm/GitHubWebhook/blob/master/sensors/webhook_sensor.py).

We're now seeing errors like this:

<snip>
  File "/opt/stackstorm/st2/lib/python2.7/site-packages/requests/packages/urllib3/util/ssl_.py", line 324, in ssl_wrap_socket
    return context.wrap_socket(sock, server_hostname=server_hostname)
  File "/opt/stackstorm/st2/lib/python2.7/site-packages/requests/packages/urllib3/contrib/pyopenssl.py", line 438, in wrap_socket
    rd = util.wait_for_read(sock, sock.gettimeout())
  File "/opt/stackstorm/st2/lib/python2.7/site-packages/requests/packages/urllib3/util/wait.py", line 33, in wait_for_read
    return _wait_for_io_events(socks, EVENT_READ, timeout)
  File "/opt/stackstorm/st2/lib/python2.7/site-packages/requests/packages/urllib3/util/wait.py", line 22, in _wait_for_io_events
    with DefaultSelector() as selector:
  File "/opt/stackstorm/st2/lib/python2.7/site-packages/requests/packages/urllib3/util/selectors.py", line 364, in __init__
    self._epoll = select.epoll()
AttributeError: 'module' object has no attribute 'epoll'

Looks to be related to this? urllib3/urllib3#1104

[arm4b]

@Kami The fix looks like using newer patched version of requests >= 2.14.0 or revert to the older one. WDYT?

[Kami]

@LindsayHill @armab one option which I think should also work is for githubwebhook pack explicitly specify older version of requests in requirements.txt.

WDYT?

[Kami]

In the worst case, we can revert the upgrade, but recent versions contain various security fixes (https://github.com/request/request/blob/master/CHANGELOG.md) so it would be a good idea to upgrade.

[arm4b]

The latest version is 2.14 and even 2.14.1, see changelog: https://github.com/kennethreitz/requests/blob/master/HISTORY.rst

We know that it fixes urllib3/urllib3#1104 (comment) bug
Can we pin to latest instead? That will recover st2cicd.

[Kami]

Works for me

[LindsayHill]

+1