8181449: Fix debug.hpp / globalDefinitions.hpp dependency inversion
Summary: Refactor debug.hpp and reverse include dependency.
Reviewed-by: coleenp, stefank, dcubed

8166117: Add UTC timestamp decorator for UL
Reviewed-by: rehn, rprotacio

8145934: Make ttyLocker equivalent for Unified Logging framework
Reviewed-by: rprotacio, stuefe, jrose

8148219: Add decorator hostname to UL
Reviewed-by: dholmes, mlarsson
Contributed-by: robbin.ehn@oracle.com

8144702: Using tid decorator in Unified Logging may crash VM
Summary: LogDecorations::create_tid_decoration should avoid Thread::current() if possible.
Reviewed-by: mlarsson, coleenp

8046148: JEP 158: Unified JVM Logging
Reviewed-by: coleenp, sla