[patch] server status getinfos

[Robert Hogan]

Adds getinfo:

    "status/good-server-descriptor"
    "status/or-reachability-succeeded"
    "status/dir-reachability-succeeded"

and splits out the REACHABILITY_SUCCEEDED event into:

OR_REACHABILITY_SUCCEEDED
DIR_REACHABILITY_SUCCEEDED

This makes sense because it maintains the one-to-one relationship between 
getinfo requests and status-events, getinfo reachability-succeeded would be 
too ambiguous to be useful, and makes writing controllers simpler because it 
is easier to identify the meaning of a status event by the 'action' of *all* 
status events rather than, in special cases, a combination of the action and 
one or more of the arguments.

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