python::pip install args needs extra space to separate multiple args

[kpurdon]

python::pip given this option:

install_args => ['--pre', '--upgrade']

will generate pip install --pre--upgrade [something] (note pre and upgrade have no space). To correct this you have to add an additional space after each arg:

install_args => ['--pre ', '--upgrade ']

which will correctly generate pip install --pre --upgrade [something].

[adamcstephens]

install_args is actually a string, even though the README shows it as an array.

https://github.com/stankevich/puppet-python/blob/master/manifests/pip.pp#L43-L45

Even more fun, is in future parser you get the array translated into a string, brackets and all.