T6375: Fix/Update NAT logging
Fixed broken logging for "show log nat"

Added the following commands:
show log nat source
show log nat source rule <ruleNum>
show log nat destination nat
show log nat destination nat rule <ruleNum>
show log nat static
show log nat static rule <ruleNum>

(cherry picked from commit 5cb9b84bd9ce909460d8da7f039d9371143ede6c)