* Initial envoy cgroup resource monitor implementation
* Add cgroupv1 support; add metrics instrumentation
* Slight refactor for more efficient memory limit detection
Instead of reading memory.max/limit_in_bytes on every tick, we
read it once, then again only when it is modified.
To support this change, logic for computing the saturation was moved out
of the cgroup driver and into the resource monitor, and the driver
interface now has separate methods for reading memory usage and limit.
* Code cleanup/lint fixes
* Add platform build tags
* Add unit tests
* Fix lint issues
* Add runtime flag to allow disabling resource monitor
* Clamp saturation values to the range [0.0, 1.0]
* Switch to x/sys/unix; handle inotify IN_IGNORED events
Go raises the "max open files" soft limit to match the hard limit for
itself, but has special logic to reset the original soft limit before
forking a child process. This logic does not apply if the file limit is
set explicitly. Add a pair of Getrlimit / Setrlimit calls so that we
(1) preserve the default Go limit behavior for ourselves, and
(2) keep these same limits when launching Envoy.
* support loading route configuration via rds
* fix any shadowing
* fix test
* add fully static option
* support dynamically defined rds
* fix build
* downgrade opa
