Enhancements to validator-info

The validator-info diagnostic script is an excellent addition to the Indy suite.  Here are a few additional features that will enhance its usefulness:

1. In the verbose human-readable output, indicate the time (which must include the timezone) in ISO 8601 format.  For example: "Current time:    2017-12-15T15:53:00+05:00"
2. In addition to the DID and verkey, report the BLS public key
3. Indicate the nodes that are the current primaries.  In the verbose human-readable output, this can be indicated by the primary number in parenthesis after the name of the nodes that are primaries, in this fashion:

Reachable Hosts: 10/10
RFCU
australia   (1)
brazil      (0)
canada
england     (2)
korea       (3)
mapleleaf
ricFlair
singapore
virginia

For the json output, this could be done using a hash instead of a list for the nodes as shown, or by another means:

{
"RFCU": null,
"australia": 1,
"brazil": 0,
"canada": null,
"england": 2,
"korea": 3,
"mapleleaf": null,
"ricFlair": null,
"singapore": null,
"virginia": null
}