Prior to this commit, the `Util::Powershell.execute_inline`
method didn't properly join the passed in command and instead attempted
to execute the array of strings. This commit updates that
behavior to join the command array prior to inserting it into the full
powershell command.
Prior to this commit, the function used to determine the version of
Powershell would loop forever inside the Subprocess.execute function
because the process would never exit. This commit fixes that by passing
in a ruby block to capture the version from stdout instead of trying to
capture it from the returned process when it exits.
Adds powershell validation to ensure powershell is available on
the PATH and checks powershell version to ensure meets the
defined minimum powershell version.
