Malfunctions on PowershellCore OSX & LInux

[Nissplus]

Title

Malfunctions on PowershellCore OSX & Linux

Description

On OSX and Linux AzSK runs the builtin policies, but fails to upload organization policy extensions to the storage account and fails to run them.

Since outside pull requests are not being accepted, applying the following diffs will make things work:
master...gfrascadorio:master

Steps to reproduce

Issue 685 may also be caused by this problem. If one uses Linux or OSX to follow the instructions for Extending AzSK Modules and then call Install-AzSKOrganizationPolicy or Update-AzSKOrganizationPolicy, no *.ext.ps1 files will be uploaded to the storage account.

The issue seems to be the use of Windows specific:

• directory separators
• path separators
• mode bits
• non-portable construction of paths using + instead of Join-Path

Expected behavior

*.ext.ps1 files would be uploaded

Actual behavior

Files not uploaded