This change temporarily disables Pylint. Assuming it is on the path,
and furthermore that the one on the path runs under 2.7, simply won't
work. See pulumi/pulumi#1007 for details; it also tracks reenabling.
This change includes a few things:
1) Prefer python2 and pip2 when on the PATH, over the undecorated
names python and pip. This is the standard convention for package
managers like Pip, etc., to support Python2 and Python3 side-by-side.
2) Fail-fast if neither can be found on the PATH.
3) Check the reported version number for python, pip, and pylint, and
fail-fast if it doesn't report back 2.7, just to safeguard against
undecorated binaries with unsupported versions.
Also, we had not listed wheel as a dependency in the requirements.txt
file. This needs to be there to support building bdist_wheels. Fixed.
We now publish the Pulumi Python SDK package to our private PyPI
server at the same time we also publish the NPM package. For now,
we use the test Pulumi.com service, and will switch to staging as
soon as it becomes available.
Pip is called `pip2.7` in Travis' Mac image. Our script already
had to deal with this, but did so by conditionalizing the name we
use in our scripts. Rather than doing that, let's create a symlink
with the name `pip` so that everything can just use the good name.
For some tools we used, like `dep` and `gometalinter` we were just
calling `go install` which caused us to pick up whatever was in `HEAD`
at that time. Now, we move to a model where we install fixed versions,
which will change per milestone.
While doing this, I changed the way our .travis.yml file runs
everything to move as much as possible out into scripts and do so in a
way that allows us to share as much common logic across our
repositories.
