[rancid] Nexus 9K support in RANCiD 3.7

[Charles T. Brooks]

We recently outfitted a new office with Cisco Nexus 9000s.  I monitor router and switch configuration changes enterprise-wide with custom built RPM packages of RANCiD on RHEL7 with git and gitweb.

The 9Ks have a constantly changing file date on a subfolder that can't be controlled:

- !Flash: logflash:       69632    Dec 29 01:37:09 2017  debug_logs/
+ !Flash: logflash:       69632    Dec 29 02:42:52 2017  debug_logs/

The following code patch to v7 prevents this from generating hourly commits and emails.

--- nxos.pm.in.orig     2017-12-29 13:02:01.347259970 -0500
+++ nxos.pm.in  2017-12-29 13:03:39.336922201 -0500
@@ -497,7 +497,7 @@ sub DirSlotN {
        /\s+vtp_debug(_old)?\.log$/ && next;

        next if (/BufferMonitor-1HourData/);
-       if (/ log\/$/) {
+       if (/[_ ]logs?\/$/) {
            # change
            #         8192    Jan 08 14:05:05 2015  log/
            # to

There's also a problem with a constantly fluctuating memory size value, but I haven't figured out how to fix that.

Thank you Heasley and co-conspirators for a great tool!

--Charlie
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