Create scion-sosreport for support cases

[mkowalski]

As a user supporter I want to have an easy way to look into user's environment to check the status of the operating system and SCION services. In order to achieve this, I should have a simple scripts which user can run in order to generate an archive containing all the informations.

There is already such a tool for RedHat support, i.e. sosreport -- https://access.redhat.com/solutions/3592

We should have an equivalent, i.e. scion-sosreport, collecting the following informations (but not limited to)

• hardware information, e.g. CPU and memory usage
• network interfaces and their configuration (IPs, routes, firewall)
• VPN configuration if existing
• packages installed in the OS
• gen/ folder or at least topology file
• systemd configuration related to the SCION services

Instead of developing an in-house solution a possibility would be to use https://github.com/sosreport/sos and write a SCION(Lab) plugin (https://github.com/sosreport/sos/wiki/How-to-Write-a-Plugin).

[matzf]

After some discussion here: this sosreport tool is intended to simply provide all information to the experts, not to interpret the data and be a the health-check tool that a user would look at.
As we'd also like to have a better health-check tool (currently only available in webapp), one way to combine these two efforts could be that we write the health-check tool as a pure "analyzer" of the data collected by the sosreport tool.