Fix HTTPS, use new rundeck-plugins parent pom, add error messages

Three main changes

1) configuring HTTPS was throwing a null pointer exception with no logs at all, fixes included
2) Add some verbose logging messages
3) Use rundeck-plugins parent pom which is enabled for maven central repo via oss.sonatype.org

SNAPSHOT deployed
https://oss.sonatype.org/content/repositories/snapshots/org/rundeck-plugins/rundeck-winrm-plugin/1.1-SNAPSHOT/