Support extended pod logging options

Increase the supported controls on pod logging. Add validaiton to pod
log options. Ensure the Kubelet is using a consistent, structured way to
process pod log arguments.

Add ?sinceSeconds=<durationInSeconds>, &sinceTime=<RFC3339>, ?timestamps=<bool>,
?tailLines=<number>, and ?limitBytes=<number>

contrib/completions/bash/kubectl

@@ -533,8 +533,13 @@ _kubectl_logs()
     flags+=("--follow")
     flags+=("-f")
     flags+=("--interactive")
+    flags+=("--limit-bytes=")
     flags+=("--previous")
     flags+=("-p")
+    flags+=("--since=")
+    flags+=("--since-time=")
+    flags+=("--tail=")
+    flags+=("--timestamps")
 
     must_have_one_flag=()
     must_have_one_noun=()