The default value of quota_firewall_rule should not be -1

A bad tenant User can create unlimited firewall rules to
"attack" the network node, so I modify the default value to 100.

Change-Id: I485c24cb1a7ed77dee81356fe6d95276808a47d4
Closes-Bug: #1346372
Merge "The default value of quota_firewall_rule should not be -1"