Clean up linux test decorators and add links to known bugs
- s/skipOnLinux/skipIfLinux/ to match style of every other decorator
- linkify bugizilla/PR numbers in comments

No intended change in functionality.



git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@181913 91177308-0d34-0410-b5e6-96231b3b80d8