Make an attempt to get environment information for non-Windows platforms

[JamesWTruher]

I'm definitely missing environment information when running Pester in our CI on Non-Windows platforms. I would love if the logs had that information. This is an attempt at providing that information with tools that will probably be there. I'm using uname and id to provide that info. If those tools aren't there, we won't be any worse off, but if they are there, then we can provide the test environment pretty well.

[JamesWTruher]

@dlwyatt @it-praktyk @nohwnd - Could you take a look to see if I've taken an appropriate approach? Thanks!

[nohwnd]

@JamesWTruher tested it on macOS and the only thing I found that the username is not just username but a whole user info. To print just username it should be id -un, which worked on macOS, but I haven't tested it on linux.

Name                           Value
----                           -----
cwd                            /Users/nohwnd/projects/pester_main
user-domain
nunit-version                  2.5.8.0
clr-version                    Unknown
user                           uid=501(nohwnd) gid=20(staff) groups=20(staff...
platform                       Darwin
os-version                     17.7.0
machine-name                   nmbp

[it-praktyk]

Tested on Linux.

id returns

uid=1000(<USER_NAME>) gid=1000(<USER_NAME>) groups=1000(<USER_NAME>),10(wheel),18(dialout),970(vboxusers) context=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023
``

[it-praktyk]

<?xml version="1.0" encoding="utf-8" standalone="no"?>
<test-results xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="nunit_schema_2.5.xsd" name="Pester" total="982" errors="0" failures="5" not-run="0" inconclusive="0" ignored="0" skipped="0" invalid="0" date="2018-09-30" time="11:07:18">
  <environment machine-name="<COMPUTERNAME>>" os-version="4.18.9-200.fc28.x86_64" nunit-version="2.5.8.0" user="<USER_NAME>" cwd="/home/<USER_NAME>/Scripts/Pester" platform="Linux" user-domain="" clr-version="Unknown" />

OUTPUT_PARTIALLY OMITTED

[nohwnd]

@it-praktyk what does that mean? That it works? Or that it does not work? More context please.

(btw I added the -un parameter some hour ago.)

[it-praktyk]

It works like expected now. Means returns only the username, the single word.

[JamesWTruher]

I was wondering about id vs id -un. I chose id because I thought more info would be better, but if it's really just about the username, then id -un matches intent better.
Thanks for the quick look!
@it-praktyk @nohwnd

[nohwnd]

It’s out.