RFR: 7199143: OCSP revocation checker should provide possibility to specify connection timeout

[Jason Uh]

Could I please get a review of
http://cr.openjdk.java.net/~juh/7199143/webrev.00/
This changeset makes the OCSP connection timeout length configurable 
through a system property. Note that there is no regression test here, 
as Artem will be writing one separately.

Thanks,
Jason