Test metadata files: bump expiration date and resign

[MVrachev]

Description of the changes being introduced by the pull request:

Our newly added metadata files in the
tests/repository_data/fishy_rolenames/metadata directory have an expiry
date until "2021-10-22T11:21:56Z" and today while running the tests on
develop branch I recived this error:
ExpiredMetadataError("Metadata X expired on Fri Oct 22 11:21:56 2021")
when running the tests in tests/test_updater.py file and more precisly
the TestUpdaterRolenames.test_unusual_rolenames() test.

That's why I decided to bump the expiration date to a random time in
the future (October 22-nd 2050) and I had to resign all of the metadata
files.

Signed-off-by: Martin Vrachev mvrachev@vmware.com

Please verify and check that the pull request fulfills the following
requirements:

• The code follows the Code Style Guidelines
• Tests have been added for the bug fix or new feature
• Docs have been added for the bug fix or new feature

[coveralls]

Pull Request Test Coverage Report for Build 1375801096

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 97.427%

---

Totals
Change from base Build 1369286823:	0.0%
Covered Lines:	3943
Relevant Lines:	4027

---

💛 - Coveralls

[MVrachev]

The test failure I described can be seen here:
https://github.com/theupdateframework/python-tuf/runs/3984749289?check_suite_focus=true

[jku]

Thanks. I produced this from RepositorySimulator (where the expiry doesn't matter as we re-generate for every test run) and failed to notice this 🤦

[coveralls]

Pull Request Test Coverage Report for Build 1375801096

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+1.1%) to 98.477%

---

Totals
Change from base Build 1369286823:	1.1%
Covered Lines:	3782
Relevant Lines:	3808

---

💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 1375801096

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+1.1%) to 98.477%

---

Totals
Change from base Build 1369286823:	1.1%
Covered Lines:	3782
Relevant Lines:	3808

---

💛 - Coveralls