isOpenShiftS2I() fails for multi-maven builds

[jstrachan]

if we can't find the openshift.yml file lets iterate through the local file system in a multi maven project until we find it https://github.com/fabric8io/fabric8-pipeline-library/blob/master/src/io/fabric8/Fabric8Commands.groovy#L496

[rupalibehera]

@rawlingsj I have opened a pull request for this issue https://github.com/fabric8io/fabric8-pipeline-library/pull/23