fb_helpers: interface_change_allowed regexp fix (facebook#342) (facebook#343)

Test Plan:
Imported from GitHub, without a `Test Plan:` line.
Ran chef, confirmed no pending network change triggered:
```
[root@twshared22960.15.ftw3 ~]# ls -la /run/chef/
total 0
drwxrwxrwt  2 root root   40 Nov 13 01:17 .
drwxr-xr-x 74 root root 1860 Nov 26 16:46 ..
```

Reviewed By: dafyddcrosby

Differential Revision: D87958589

Pulled By: joshuamiller01

fbshipit-source-id: 8e28e9c8743ff7d383c074238022505f2e3d04ea

Author: bwann

cookbooks/fb_helpers/libraries/node_methods.rb

@@ -1451,7 +1451,7 @@ def interface_change_allowed?(interface)
       else
         return self.nw_changes_allowed? ||
           ['ip6tnl0', 'tunlany0', 'tunl0'].include?(interface) ||
-          interface.match(Regexp.new('^tunlany\d+:\d+'))
+          interface.match?(Regexp.new('^tunlany\d+:\d+'))
       end
     end