fix caps: PyPi => PyPI
sunos : fix starting errors on SunOS

Make use of XPG4 binaries on SunOS. This will fix the
following errors :

```shell
grep: illegal option -- E
Usage: grep [-c|-l|-q] [-r|-R] -hbnsviw pattern file . . .
grep: illegal option -- E
Usage: grep [-c|-l|-q] [-r|-R] -hbnsviw pattern file . . .
sh: line 335: whoami: not found
sh[335]: [: argument expected
```
Merge pull request #134 from cvrebert/patch-1

fix caps: PyPi => PyPI
Merge pull request #135 from virtua-network/fix_sunos

sunos : fix starting errors on SunOS
Define the stable salt version to test in a single place and use that.
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