This fixes the links for installing 2017.7.0 (the executor link has
changed to include a "Py2" or "Py3" section). It also allows the user
to specify if the Py2 or Py3 executor should be used. This option only
works for Salt >= 2017.7.0.
Example for Py2 (default behavior):
```
./bootstrap-salt.ps1 -pythonVersion 2
```
Example for Py3:
```
./bootstrap-salt.ps1 -pythonVersion 3
```
Yep, $env:temp is even better but lets change things step by
step.
This makes script inconsistent as other parts still use c:\tmp
for storing configuraiton files. I don't want to change them
as it is *very* likely users upload configuraiton files there
already using external scripts.
This will install a minion locally on windows. Option parameters will accept version, minion id, master id, and a flag for stopping and setting the salt-minion service to manual for local testing. Passing in a verbose flag will increase logging. Finally, help is displayed via
man ./bootstrap-salt.ps1
help ./bootstrap-salt.ps1
