title: Issue with imported scope poms (spring bom io dependency issue)
body: <p>My company policy restricts us from downloading thirdparty artifacts from public repositories (maven_central, spring-io etc)
  We use Nexus as a repository manager which hosts all the artifacts that are approved by our company policy.</p>
  
  <p>We are trying to use io-platform bom pom in our project to manage all spring dependencies. </p>
  
  <p>We have uploaded all boms and its dependencies in our company repository. Verified also, everything is there in the company repos.<br>
  In my settings.xml all repositories (hosted by company) are properly mentioned. 
  But somehow for spring-framework-bom project maven searches only in central even if it is disabled in settings.xml.It should ideally search in our company repositories first. </p>
  
  <p>We are getting the below exception.
  <code>
  Exception trace:
  org.apache.maven.reactor.MavenExecutionException: POM 'org.springframework:spring-framework-bom' not found in repository: Unable to download the artifact from any repository org.springframework:spring-framework-bom:pom:4.0.6.RELEASE
  from the specified remote repositories:
    central (<a href="http://repo1.maven.org/maven2" rel="nofollow">http://repo1.maven.org/maven2</a>)
  </code></p>