Change TTL to accept unit

[mderka]

As per suggestion of @jgeewax, change ttl in DnsRecord to accept duration as a number and TimeUnit. For an example, see e.g. here:

https://github.com/GoogleCloudPlatform/gcloud-java/blob/master/gcloud-java-storage/src/main/java/com/google/gcloud/storage/Storage.java#L1475

[jgeewax]

Cool - thanks for looking at this.

I was thinking this might make more sense as taking a number (ie, 123 meaning "123 seconds") as well as a Duration (ie, Duration.ofSeconds(123) being "123 seconds").

Does that make sense? @aozarov , @mziccard, thoughts ?

[mziccard]

If I am not mistaken Duration.ofSeconds is part of Java 8 and now we are sticking to java 7.

As soon as we move to java 8 we should support Duration and all of java8's time support.

[mderka]

So, for now we have the TimeUnit solution. Duration.ofSeconds should be implemented when moving to Java 8.

[aozarov]

Right, I think #592 is the best we can do for now.

We already have an open issue for changing our API on Java 8 (#108) and we can use that issue as
a laundry list of things that we should change (including this one). In that case, I think we can close
this issue.. @jgeewax ?

[jgeewax]

If it's covered by #108, then sure.