Add kerberos password property to NiFi HBase components

In addition to the principal/keytab and KerberosCredentialsService options for accessing kerberized services from NiFi HBase components, a password field should be added.

Components should validate that only one set of options should be configured:

• principal and keytab
• principal and password
• KerberosCredentialsService

The components that will be affected by this change:

• HBase_1_1_2_ClientService
• HBase_2_ClientService