Shorten the timeout period when we attempt to create a connection

Add an MCA parameter to allow it to be tuned by users and admins, but default it to 0.1 seconds. Need verification by others to ensure this is adequate.

@ggouaillardet please verify this and check the default value works for you

if a timeout occurs, then select returns 0, and this case is not handled :
a simple helloworld takes several minutes before failing