more tests using HystrixRequestContext rule

[caarlos0]

Replaced the manual HystrixRequestContext inits and shutdowns with the junit rule.

My IDE also auto-fixed some trailing whitespaces, that's why the pull seems a little big. A diff -w should do the trick.

refs #1184 and #1147

cc/ @mattrjacobs

[cloudbees-pull-request-builder]

NetflixOSS » Hystrix » Hystrix-pull-requests #457 SUCCESS
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[mattrjacobs]

Thanks @caarlos0! This looks like it should introduce a circular dependency where hystrix-junit:compile depends on hystrix-core:compile, and hystrix-core:test depends on hystrix-junit:compile. From running tests locally and in CI, it looks like Gradle is able to sidestep the circularity.

[caarlos0]

@mattrjacobs yeap, gradle seems to be smart enough to handle that...