added DTO validators

Signed-off-by: juliusmercons <julius.masanting@orangeandbronze.com>
added form validation to User module.

Signed-off-by: juliusmercons <julius.masanting@orangeandbronze.com>
cleaned pom.xml

Signed-off-by: juliusmercons <julius.masanting@orangeandbronze.com>