[rancid] small patch to rancid for Cisco WAE/ACNS

[Hock Jim]

We've had to make a small change to RANCID for it to run with our Cisco WAEs
running ACNS software.

/bin/rancid uses the following string matching in "show version" to detect
Cisco Content Engines:

if (/^Application and Content Networking Software/) { $type = "CE"; }

but our presumably more recent ACNS version (5.5.1x) returns the following,
with an extra word "System" breaking the string matching:

[***@RANCID configs]$ clogin -c "show ver" acns | grep -i acns
Application and Content Networking System Software (ACNS)

We patched the string matching to the following, and it all works well.

if (/^Application and Content Networking.*Software/) { $type = "CE"; }

Wondering if the maintainers can commit this (or whatever is similar/more
appropriate). Thanks!