fix: reset_network to correctly reset time info

[bonlime]

Fixes #511

Tests were vibed so if you think it's a little verbose, can shorten them

[MicaiahReid]

Hmmm, I'm not sure about this.

When you first start a surfnet, the epoch info will come from the mainnet datasource. Now, we're clearing it out to zero.

I'm not sure what the expected behavior should be, one of these:

1. Clear it out to zero like you have it
2. When we first set the Epoch info after fetching from mainnet, cache "genesis info", and reset to that
3. On reset, refetch from mainnet and have that new value be our epoch info

I'm of the opinion that we should go with option 2. Thoughts, @bonlime, @lgalabru?

[bonlime]

that's a good point, I personally would go with option 3, since it would be closer to "full reset", I'll see if it's easy enough to do

[lgalabru]

I'd go with option 3 when the surfnet has a datasource, and keep option 1 when the surfnet is offline

[MicaiahReid]

Okay, sounds good. Let's go with option 3, @bonlime. Thanks!