Batch testing list of DCs

[renatoSeven]

Background:

Modified your script to run against a list of DC hostnames in secondary TXT file and bugs found on original script.

Running:

Executing the script on the list of DCs, worked OK on 10% of the list the rest failed the RPC connect function.
Executing the script on the list of DCs, worked OK on 10% of the list the rest failed the RPC connect function.
Of the 10%, got ~50/50 of vulnerable and not vulnerable, so the script is working but with very low percentage of accuracy.
There may be a problem on "impacket" module when trying to establish connection to destination host.

Checks:

Validated network connectivity OK, validated RPC(135) and SMB(445) connectivity OK.

[sanmai-NL]

Please refer to #9 (comment).