[MRM-1744] updating managed repository fail to correctly update maven index directory.

git-svn-id: https://svn.apache.org/repos/asf/archiva/trunk@1443216 13f79535-47bb-0310-9956-ffa450edef68
correctly delete previous index directory

git-svn-id: https://svn.apache.org/repos/asf/archiva/trunk@1443217 13f79535-47bb-0310-9956-ffa450edef68
be consistent for repository created with a relative path with default ones

git-svn-id: https://svn.apache.org/repos/asf/archiva/trunk@1443218 13f79535-47bb-0310-9956-ffa450edef68