Validate genesis before running gentx

[sabau]

• Closes run validate genesis before running gentx and return error #3825

• Targeted PR against correct branch (see CONTRIBUTING.md)

• Linked to github-issue with discussion and accepted design OR link to spec that describes this work.

• Wrote tests

• Updated relevant documentation (docs/)

• Added a relevant changelog entry: sdkch add [section] [stanza] [message]

• rereviewed Files changed in the github PR explorer

---

For Admin Use:

• Added appropriate labels to PR (ex. wip, ready-for-review, docs)
• Reviewers Assigned
• Squashed all commits, uses message "Merge pull request #XYZ: [title]" (coding standards)

[codecov]

Codecov Report

Merging #3927 into develop will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop    #3927   +/-   ##
========================================
  Coverage    60.26%   60.26%           
========================================
  Files          196      196           
  Lines        14615    14615           
========================================
  Hits          8808     8808           
  Misses        5214     5214           
  Partials       593      593

[jackzampolin]

PENDING too?

[alessio]

This needs a mention in the Gaia stanza of changelog's bugfixes or improvements section: sdkch add gaia bugfixes

[sabau]

My bad, I haven't pushed it