Revert "Prefer BouncyCastle as security provider"
Revert "Prefer BouncyCastle as security provider"

This reverts commit 617331d3a8f8d78fd0eb4ea6888649ef814fb61c.
This approach will not work as BouncyCastle JARs are loaded as bundles (not available on classpath).

vespa-engine/vespa,vespa-engine/vespa,vespa-engine/vespa,vespa-engine/vespa,vespa-engine/vespa,vespa-engine/vespa,vespa-engine/vespa,vespa-engine/vespa,vespa-engine/vespa,vespa-engine/vespa