Infinite loop in install_red_hat_linux_stable_deps

Success installing the package(s) doesn't break out of the retry loop

Signed-off-by: Dan Mick <dan.mick@inktank.com>
Merge pull request #439 from dmick/develop

Infinite loop in install_red_hat_linux_stable_deps
Add Dan Mick(@dmick) to AUTHORS
Only check `salt-api` service if the `salt-api` binary is present in the system.

Closes #436.
Closes #437.
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