Make `issue` field optional in `#[unstable]` to avoid `issue = "0"`#60860

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Julian-Wollersberger wants to merge 7 commits intorust-lang:masterfrom

Julian-Wollersberger:41260_Tidy_feature_deny_commits_with_a_tracking_issue_of_0

Commits on May 15, 2019

Began changing the type in `StabilityLevel::Unstable` from `issue: i32` to `issue: Option<i32>`
Julian-Wollersberger
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Modified ui test cases and temporarily changed the type back to i32 to test them.
Julian-Wollersberger
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Types changed to `issue: Option<i32>` in a few places and I added a basic ui test.
Julian-Wollersberger
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Made a warning for issues #0 and moved some code around.
Julian-Wollersberger
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Removed most `issue = "0"` from ui tests.
Julian-Wollersberger
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Commented out the warning.
Julian-Wollersberger
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Blessed line number changes in ui tests.
Julian-Wollersberger
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