Clean up container shutdown

1) Don't explicitly clean up emphemeral ZK nodes.  These will go away when
shutdown the ZK connection, and if we lost zk server these function will not
complete.
2) Sanify (as in make sane) healthcheck exit channel handling.
3) Stop performing health checks after container exit has been requested.
Merge pull request #1066 from control-center/feature/shutdownZk

Clean up container shutdown
fixes CC-177, add default timeouts to health checks, support for reaping zombie procs, and improve container logging on exit.
Merge pull request #1068 from control-center/feature/CC-177-3

fixes CC-177, add default timeouts to health checks
Detect NFS service name based on platform
Merge pull request #1069 from control-center/feature/rhelNfsCompat

Detect NFS service name based on platform
initial pass at template mirroring script
clean up main path, move err handling to functions
fixes CC-157, pass host aliases to web handler
add default http pprof profiling
Merge pull request #1070 from control-center/feature/CC-119

initial pass at template mirroring script
Merge pull request #1071 from control-center/feature/CC-157

fixes CC-157, pass host aliases to web handler
fix translations
fix about table width
Merge pull request #1073 from control-center/fix/cc-187-189

fix translations
Merge pull request #1074 from control-center/feature/CC-188

fix about table width
Merge pull request #1076 from control-center/feature/Centos7Compat

make serviced.default be compatible as systemd env file
Add rudimentary suport for systemd