[MRM-1750] Add remote repository health check
Add rest api

git-svn-id: https://svn.apache.org/repos/asf/archiva/trunk@1552981 13f79535-47bb-0310-9956-ffa450edef68
[MRM-1750] Add remote repository health check
add unit test

git-svn-id: https://svn.apache.org/repos/asf/archiva/trunk@1552982 13f79535-47bb-0310-9956-ffa450edef68
add unit test

git-svn-id: https://svn.apache.org/repos/asf/archiva/trunk@1552983 13f79535-47bb-0310-9956-ffa450edef68
[MRM-1750] Add remote repository health check
ui implementation

git-svn-id: https://svn.apache.org/repos/asf/archiva/trunk@1552984 13f79535-47bb-0310-9956-ffa450edef68