Cli record add remove

[codefromthecrypt]

for issue #11

This allows the cli to add and remove records. --ttl is optional on record add, and when it is specified, it will replace whatever the old ttl is on existing records.

There's no impact if you remove a record already gone, or add one that already exists, unless you specify an updated --ttl.

Examples (keeping in mind mock is not durable)

Adding multiple records:

$ denominator -p mock record -z denominator.io. add -n www1.myzone.com. -t A -d 1.1.1.1 -d 1.1.1.2
;; in zone denominator.io. adding to rrset www1.myzone.com. A values: [{address=1.1.1.1},{address=1.1.1.2}]
;; ok

Adding a record and replacing ttl:

$ denominator -p mock record -z denominator.io. add -n www1.myzone.com. -t A --ttl 3600 -d 1.1.1.1
;; in zone denominator.io. adding to rrset www1.myzone.com. A values: [{address=1.1.1.1}] applying ttl 3600
;; ok

Removing a record:

$ denominator -p mock record -z denominator.io. remove -n www1.myzone.com. -t A -d 1.1.1.1
;; in zone denominator.io. removing from rrset www1.myzone.com. A values: [{address=1.1.1.1}]
;; ok

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