New option runas

- New option: runas_appsuser so the script can be run as a specific user.
- Grammar fix
Balancer manager and others

- The balancer manager is used to control a balancer-manager
  from mod_proxy_balancer.  This is used for staggered
  deployments on a system.
- env-security-check takes shell files in stdin and processes
  them line by line to check that only non-system environment
  variables are being assigned and no commands are possibly
  being executed.  This is a security check for cluster
  deployments when a cluster machine pulls an environment file
  from a centralized deploy file for what it should do.  Using
  it is recommended in that scenario.