Reuse the same instance of HttpClient in CLI to avoid opening multiple connections to director.
Reuse the same instance of HttpClient in CLI to avoid opening multiple
connections to director.

[#104469472](https://www.pivotaltracker.com/story/show/104469472)

Signed-off-by: Victor Fong <95c00c4b759dfd5c0c9bab0c67fa20ed75fca00d@emc.com>

barthy1/bosh,barthy1/bosh,barthy1/bosh,barthy1/bosh