~ajkavanagh/charms/trusty/mongodb/fix-unit-test-lint-lp1533654

Ensure yaml library is usable

Newer Ubuntu versions don't have python-yaml installed by default.

Handle this automatically in the charm.

added added

removed removed

import subprocess

import sys

import time

import yaml

try:

import yaml # flake8: noqa

except ImportError:

if sys.version_info.major == 2:

subprocess.check_call(['apt-get', 'install', '-y', 'python-yaml'])

else:

subprocess.check_call(['apt-get', 'install', '-y', 'python3-yaml'])

import yaml # flake8: noqa

from os import chmod

from os import remove