Support keyboard-interactive authentication for SFTP

Changing the supporting library from JSch to SSHJ resulted in removing support for keyboard-interactive authentication when configuring a password in SFTP components. 

Some SSH servers disable password authentication but support keyboard-interactive authentication.  SSHJ provides support for keyboard-interactive authentication using a password, and SFTP components should attempt both password authentication and keyboard-interactive authentication when a password is configured.

Without support for keyboard-interactive authentication, SFTP processors report the following error even when configured with valid username and password credentials:

UserAuthException: Exhausted available authentication methods

SSHJ reports the following debug log with valid credentials when the server has disabled password authentication:

net.schmizz.sshj.userauth.UserAuthImpl `password` auth failed