ibacm: Eliminate device event handler thread.

ibacm: Eliminate device event handler thread.

The event handler thread creates synchronization issues
with the client request, especially when address/endpoint/port
is removed or shut down. This patch moves the device event
handling code into acm_server() so that event and client
reqest are serialized to avoid any potential synchronization
issues.  We also lose the overhead of an additional thread.

Signed-off-by: Kaike Wan <kaike.wan@intel.com>
Signed-off-by: Sean Hefty <sean.hefty@intel.com>