Make sanity checks actually check sanity

[meeDamian]

Currently they only print things out. They should be performing some automated tests there too.

[meeDamian]

That issue applies to all Go repos. Should be implemented in the template, and then backported to:

• https://github.com/lncm/docker-lnd
• https://github.com/lncm/docker-ipfs
• https://github.com/lncm/invoicer