Work in progress: convert client to jscep v2.0

Change-Id: Ib1ed747022679c87e0d2991d4f1c530a1bd5d1ec
Add support for log4j. (enable with -v parameter)

Change-Id: Ib73a1206170194b44cacb02c052c756d5066c0a1
Simplify code for setting PKCS#10 password.

Change-Id: Ib362681aff9f1a0443cfb87a2bd5e12172c652d9
Merge pull request #6 from pontillo/jscep2.0

Migrate to jscep, 2.0 and hook verbose parameter to additional log4j debugging.