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
    Affects Versions: 3.3.1
            Reporter: Nicholas Harteau
            Priority: Minor
         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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