Work on ZOOKEEPER-905 stopped by Nicholas Harteau.

> enhance zkServer.sh for easier zookeeper automation-izing
> ---------------------------------------------------------
>                 Key: ZOOKEEPER-905
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-905
>             Project: Zookeeper
>          Issue Type: Improvement
>          Components: scripts
>            Reporter: Nicholas Harteau
>            Assignee: Nicholas Harteau
>            Priority: Minor
>             Fix For: 3.4.0
>         Attachments: zkServer.sh.diff
> zkServer.sh is good at starting zookeeper and figuring out the right options 
> to pass along.
> unfortunately if you want to wrap zookeeper startup/shutdown in any 
> significant way, you have to reimplement a bunch of the logic there.
> the attached patch addresses a couple simple issues:
> 1. add a 'start-foreground' option to zkServer.sh - this allows things that 
> expect to manage a foregrounded process (daemontools, launchd, etc) to use 
> zkServer.sh instead of rolling their own to launch zookeeper
> 2. add a 'print-cmd' option to zkServer.sh - rather than launching zookeeper 
> from the script, just give me the command you'd normally use to exec 
> zookeeper.  I found this useful when writing automation to start/stop 
> zookeeper as part of smoke testing zookeeper-based applications
> 3. Deal more gracefully with supplying alternate configuration files to 
> zookeeper - currently the script assumes all config files reside in 
> $ZOOCFGDIR - also useful for smoke testing
> 4. communicate extra info ("JMX enabled") about zookeeper on STDERR rather 
> than STDOUT (necessary for #2)
> 5. fixes an issue on macos where readlink doesn't have the '-f' option.

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