Bound the ADB connect time with a non-blocking connect

After a disconnect, the initial blocking connect takes
a long time to return, while subsequent calls return
quicks.  Switch to a non-blocking connect to make the
re-connect time more consistent and faster overall.

Change-Id: I21d02b22a8eb9a457c2f1fa95eb17894d5612ccd
Signed-off-by: Ken Lierman <ken.lierman@windriver.com>
Reviewed-by: Gumbel, Matthew K <matthew.k.gumbel@intel.com>
Reviewed-by: Jovanovic, Radivoje <radivoje.jovanovic@intel.com>
Reviewed-by: Boie, Andrew P <andrew.p.boie@intel.com>