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Added /gatewayz endpoint

Such endpoint will list the gateway/cluster name, address and port
then list of outbound/inbound connections.
For each remote gateway there will be at most one outbound connection.
There can be 0 or more inbound connections for the same remote
gateway.

For each of these outbound/inbound connection, the connection info
similar to Connz is reported. Optionally, one can include the
interest mode/stats for each account.

Here are possible options:

* No specific options

http://host:port/gatewayz

* Limit to specific remote gateway, say name "B":

http://host:port/gatewayz/gw_name=B

* Include accounts (default limit to 1024 accounts)

http://host:port/gatewayz/accs=1

* Specific limit, say 200 (note accs=1 in this case is optional)

http://host:port/gatewayz/accs=1&accs_limit=200

* Specific account, say "acc_1". Note that accs=1 is not required then

http://host:port/gatewayz/acc_name=acc_1

* Above options can be mixed: specific remote gateway (B), with 100
  accounts reported

http://host:port/gatewayz/gw_name=B&accs_limit=200

Signed-off-by: Ivan Kozlovic <ivan@synadia.com>

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