Fixes issue with SUGHUP in services on Windows

Fixes bug: #1217043

The signal module does not have a SIGHUP member on Windows. This
commit adds conditional statements based on the platform to allow the
execution of Oslo based services on Windows.

Change-Id: Ic873ce2a3337b0832055b760607e58df92a3cead
Send rootwrap exit error message to stderr

Closes-Bug: #1219530
Change-Id: Icc2216ddb4611d8a50fc351f9117090c68c6a89e
Merge "Fixes issue with SUGHUP in services on Windows"
Merge "Send rootwrap exit error message to stderr"