Fixed JERSEY-1790.

- Client-side SSL context is initialised lazily.
- Updated SslConfigurator behaviour to ignore key manager factory initialization in case neither key password nor key store password is provided.

Change-Id: Iaff03713497c7c0f72af87e54405b0fb9b399900
Signed-off-by: Marek Potociar <marek.potociar@oracle.com>