BIND 10 #2449: Make needed things for bindctl readline support more clear

[BIND 10 Development]

#2449: Make needed things for bindctl readline support more clear
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            Reporter:  shane         |                        Owner:
                Type:  enhancement   |                       Status:  new
            Priority:  medium        |                    Milestone:  Next-
           Component:  bind-ctl      |  Sprint-Proposed
           Sensitive:  0             |                     Keywords:
         Sub-Project:  Core          |              Defect Severity:  N/A
Estimated Difficulty:  0             |  Feature Depending on Ticket:
         Total Hours:  0             |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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 We've had a number of users who installed and ran BIND 10 without readline
 support, because the needed Python module was missing. While we ''can''
 run in this mode, we should try to let users know about readline support
 so it is available for them.

 We can do two things:

 1. Add more detail to the documentation (one of the boxed "notes" perhaps)
 2. Output a message when bindctl starts saying something like "install
 readline module to use command history"

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Ticket URL: <http://bind10.isc.org/ticket/2449>
BIND 10 Development <http://bind10.isc.org>
BIND 10 Development