apache-http: Fix stubs generation.

- We're asking doclava to generate stubs for all apache http packages.
  We must therefore point it to all apache-http sources (including the
  handful that live in frameworks/base).
- Stop asking for stubs for android.net.*. These classes are still
  public frameworks API and their stubs will be present in android.jar.

(cherry picked from commit 43ffae2b513e42623b213fbf08eea9255cb8ac7e)

Change-Id: I626459d4547ae14555435da8de73645e47a3461e
1 file changed