Add SSL keystore type and truststore related configs for HBase RESTServer

The RESTServer currently relies on the following parameters to configure SSL on the REST API:

• hbase.rest.ssl.enabled
• hbase.rest.ssl.keystore.store
• hbase.rest.ssl.keystore.password
• hbase.rest.ssl.keystore.keypassword
• hbase.rest.ssl.exclude.cipher.suites
• hbase.rest.ssl.include.cipher.suites
• hbase.rest.ssl.exclude.protocols
• hbase.rest.ssl.include.protocols

In this patch I want to introduce the following new parameters:

• hbase.rest.ssl.keystore.type
• hbase.rest.ssl.truststore.store
• hbase.rest.ssl.truststore.password
• hbase.rest.ssl.truststore.type

If any of the new the parameter is not provided, then we should fall-back to the current behaviour (e.g. assuming JKS keystore/truststore types, or no passwords, or no custom trust store file).