tree c1eef0340c489d5991b8f7fe8e8416b7997757d2
parent 0d18df3f35b9f34475f204d748347cd62bffa03b
author Ray Milkey <ray@onlab.us> 1426718736 -0700
committer Gerrit Code Review <gerrit@onlab.us> 1427145134 +0000

Refactor connectivity intent creation to use builders

- Each connectivity intent now has only one constructor
- Intent constructors are now private for leaf classes and
  protected for classes that can be derived from
- Each intent class has a Builder class that accumulates
  parameters for intent creation
- Each intent class has a public static builder() method
  to create a builder
- Each Builder class has a build() method to create the
  intent from the accumulated parameters
- Added keys to a few intent types that were missing them
- Tightened up usage of checkNotNull(), taking advantage of
  the return value to save some lines of code
- Modified callers to use the builders instead of directly
  calling the constructors

Change-Id: I713185d5ecbadbf51f87ef7f68fec41102106c78