[PATCHES] Improve output of wbinfo --ping-dc

[Christof Schmitt]

The attached patches make the output of wbinfo --ping-dc more useful
for problem determination:

1) If there is an error from the ping attempt, return it to the
  client.
2) Include the name of the DC that was attempted to ping.
3) Remove redundant error messages.

With the three attached patches applied, the wbinfo output looks like
this:

# wbinfo --ping-dc
checking the NETLOGON dc connection to "ad1.EXAMPLE.COM" succeeded

# wbinfo --ping-dc
checking the NETLOGON dc connection to "ad1.EXAMPLE.COM" failed
error code was NT_STATUS_IO_TIMEOUT (0xc00000b5)

# wbinfo --ping-dc
checking the NETLOGON dc connection to "ad1.EXAMPLE.COM" failed
error code was NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND (0xc0000233)

Regards,

Christof Schmitt || IBM || SONAS System Development || Tucson, AZ
christof.schmitt at us.ibm.com  ||  +1-520-799-2469  (T/L: 321-2469)
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