title: Maven sonar plugin: trust self-signed certificate
body: <p>I try to launch <code>maven sonar:sonar</code> to a SonarQube instance on HTTPS connection with a self-signed certificate. Maven give me this error:</p>
  
  <blockquote>
    <p>[ERROR] Failed to execute goal
    org.sonarsource.scanner.maven:sonar-maven-plugin:3.4.0.905:sonar
    (default-cli) on project data.model: Unable to execute SonarQube: Fail
    to get bootstrap index from server:
    sun.security.validator.ValidatorException: PKIX path building failed:
    sun.security.provider.certpath.SunCertPathBuilderException: unable to
    find valid certification path to requested target -> [Help 1]</p>
  </blockquote>