Integrate spring-security in opennaas distribution.

To check integration is successful, I've been using sample in following url:
https://issues.apache.org/jira/browse/KARAF-785?focusedCommentId=13079628&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13079628

Notice opennaas-spring-security and war features have to be installed at boot time in order for the distribution to work properly.
Removed war from OpenNaaS boot features. Removed Taglibs bundle from
opennaas-spring-security feature.
Merge pull request #578 from isartcanyameres/feature/spring-security

Removed war from OpenNaaS boot features. Removed Taglibs bundle from
Merge pull request #580 from dana-i2cat/feature/spring-security

Feature/spring security