Port libraries to SCIONLab nextversion

[juagargi]

The SCIONLab update is coming. We need to port all existing SCION applications so they build and run with the next version.
Typically you will need to register and get a user AS from the testing coordinator at
http://http://scionlabtestbed.inf.ethz.ch:8080
And use it to run and test the application you are trying to port.
Another possibility is, of course, to install the next version in your local machine. Just check out the scionlab_nextversion branch from our repository, and build it following the standard procedure.

This issue deals with porting all libraries in this repository to the next version of SCIONLab

• pathutil
• scionutil
• shttp

[chaehni]

Closed by 87c9760