Checks against chain_id == 0 in TokenNetworkRegistry

[pirapira]

Fixes: #4886

Description

Please, describe what this PR does in detail:

• If it's a bug fix, detail the root cause of the bug and how this PR fixes it.

A proxy should try to avoid sending a transaction that's going to fail. Before this PR, TokenNetworkRegistry didn't check a condition: namely, chain_id state variable must hold a non-zero value. Otherwise, createERC20TokenNetwork() calls will fail.

This PR adds a precondition check and a post-failure check against this case.

PR review check list

Quality check list that cannot be automatically verified.

• Safety
  • The changes respect the necessary conditions for safety (https://raiden-network-specification.readthedocs.io/en/latest/smart_contracts.html#protocol-values-constraints)
• Code quality
  • Error conditions are handled
  • Exceptions are propagated to the correct parent greenlet
  • Exceptions are correctly classified as recoverable or unrecoverable
• Compatibility
  • State changes are forward compatible
  • Transport messages are backwards and forward compatible
• Commits
  • Have good messages
  • Squashed unecessary commits
• If it's a bug fix:
  • Regression test for the bug
    • Properly covers the bug
    • If an integration test is used, it could not be written as a unit test
• Documentation
  • A new CLI flag was introduced, is there documentation that explains usage?
• Specs
  • If this is a protocol change, are the specs updated accordingly? If so, please link PR from the specs repo.
• Is it a user facing feature/bug fix?
  • Changelog entry has been added

[codecov]

Codecov Report

Merging #4887 into develop will decrease coverage by 0.12%.
The diff coverage is 42.85%.

@@             Coverage Diff             @@
##           develop    #4887      +/-   ##
===========================================
- Coverage    80.83%   80.71%   -0.13%     
===========================================
  Files          119      119              
  Lines        14454    14461       +7     
  Branches      2231     2233       +2     
===========================================
- Hits         11684    11672      -12     
- Misses        2116     2128      +12     
- Partials       654      661       +7

Impacted Files	Coverage Δ
raiden/network/proxies/token_network_registry.py	72.47% <42.85%> (-2.04%)	⬇️
raiden/storage/serialization/types.py	64.17% <0%> (-4.48%)	⬇️
raiden/waiting.py	81.54% <0%> (-4.17%)	⬇️
raiden/tasks.py	68.08% <0%> (-2.84%)	⬇️
raiden/utils/echo_node.py	67.79% <0%> (-1.7%)	⬇️
raiden/network/transport/matrix/transport.py	80.29% <0%> (-0.9%)	⬇️
raiden/raiden_event_handler.py	91.41% <0%> (-0.62%)	⬇️
raiden/transfer/mediated_transfer/mediator.py	90.05% <0%> (-0.2%)	⬇️
raiden/network/proxies/token_network.py	50.24% <0%> (+0.49%)	⬆️
raiden/api/python.py	68.86% <0%> (+0.52%)	⬆️
... and 1 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 1edc704...a361a52. Read the comment docs.

[rakanalh]

Wrote why those changes are not required somewhere else

[pirapira]

@rakanalh says #4936 is about the same issue.