RFR 8077360: Lower the number of providers created when using ServiceLoader

[Valerie Peng]

Hi Sean,

Not sure if you have reviewed this or not as you were on vacation while 
Mandy and Alan reviewed this prototype fix for Jigsaw workspace earlier.
Now that the relevant Jigsaw code have been merged into JDK, I plan to 
integrate this fix into JDK workspace instead.

I verified the fixes by manually checking the number of Provider created 
by going through the security debugging output.

Bug: https://bugs.openjdk.java.net/browse/JDK-8077360
Webrev: http://cr.openjdk.java.net/~valeriep/8077360/webrev.00/

Thanks,
Valerie