Remove unused dependencies

[Celebrate-future]

@baghelamit Hi, I am a user of project com.iot.app.springboot:iot-springboot-dashboard:1.0.0. I found that its pom file introduced 49 dependencies. However, among them, 10 libraries (20%) have not been used by your project (the redundant dependencies are listed below). This PR helps com.iot.app.springboot:iot-springboot-dashboard:1.0.0 lose weight :) I have tested the revised configuration in my local environment. It is safe to remove the unused libraries.

Best regards

Redundant dependencies----

org.hibernate:hibernate-validator:jar:5.2.4.Final:compile
org.springframework.boot:spring-boot-starter-validation:jar:1.3.5.RELEASE:compile
org.springframework.boot:spring-boot-starter-tomcat:jar:1.3.5.RELEASE:compile
com.fasterxml:classmate:jar:1.1.0:compile
org.apache.tomcat.embed:tomcat-embed-core:jar:8.0.33:compile
org.apache.tomcat.embed:tomcat-embed-el:jar:8.0.33:compile
org.apache.tomcat.embed:tomcat-embed-logging-juli:jar:8.0.33:compile
org.apache.tomcat.embed:tomcat-embed-websocket:jar:8.0.33:compile
javax.validation:validation-api:jar:1.1.0.Final:compile
org.jboss.logging:jboss-logging:jar:3.3.0.Final:compile