Int parser for timeout and kerb arg support

[jborean93]

Attempt to parse the *_timeout_sec variables and fail with a better error message

Will fix the following issues in Ansible without us manually handling it there.
ansible/ansible#33339
ansible/ansible#25539

Also set's a limit on the pytest version to 3.2.5 as 3.3.0 drops support for Python 2.6 and 3.3.

[coveralls]

Coverage increased (+0.5%) to 72.349% when pulling edce459 on jborean93:parse-int into f2fae36 on diyan:master.

[coveralls]

Coverage increased (+0.5%) to 72.349% when pulling 8e56a6e on jborean93:parse-int into f2fae36 on diyan:master.

[coveralls]

Coverage increased (+0.5%) to 72.349% when pulling 591a4b6 on jborean93:parse-int into f2fae36 on diyan:master.

[coveralls]

Coverage decreased (-0.4%) to 67.945% when pulling 9c308fd on jborean93:parse-int into 718f2b7 on diyan:master.

[coveralls]

Coverage decreased (-1.8%) to 66.478% when pulling 2a97e03 on jborean93:parse-int into 718f2b7 on diyan:master.