Hack to allow conditionally compiling out lightstep#982

Closed

tschroed wants to merge 5 commits intoenvoyproxy:masterfrom

tschroed:lightstep_optional

Commits on May 15, 2017

Hack to allow conditionally compiling out lightstep.
Trevor Schroeder
committed

Commits on May 17, 2017

Fix up things that didn't patch correctly from teh g3 version.
Trevor Schroeder
committed
Clang format headers.
Trevor Schroeder
committed

Commits on May 18, 2017

Conditionalize the lightsep library dependency as well. In practice, it
Trevor Schroeder
committed
Factor lightstep_tracer_lib out into its own library for dependency management.
Trevor Schroeder
committed