Support password encryption key sharing

[kabicin]

• This change adds the field .spec.managePasswordEncryption (default is true) which enables the operator to query whether or not a Secret olo-wlp-password-encryption-key with key passwordEncryptionKey exists, and if that Secret exists, the operator will restart all running Liberty servers to mount and set the wlp.password.encryption.key variable into each pod.
• Set .spec.managePasswordEncryption to false to disable the above functionality on a per-app basis.
• When .spec.manageLTPA is true, the operator will detect changes to the password encryption Secret and reload LTPA key generation, so that the new LTPA key is generated using the password encryption key.

[kabicin]

Will be delivered with https://github.com/OpenLiberty/open-liberty-operator/pull/593