OOZIE-1549 Update hcat documentation to mention hcatalog-pig-adapter jar (bowenzhangusa via rohini)

git-svn-id: https://svn.apache.org/repos/asf/oozie/branches/branch-4.0@1525048 13f79535-47bb-0310-9956-ffa450edef68
OOZIE-1284 oozie.service.SchemaService.wf.ext.schemas in oozie-site is missing some newer xsd files (rkanter)

git-svn-id: https://svn.apache.org/repos/asf/oozie/branches/branch-4.0@1525173 13f79535-47bb-0310-9956-ffa450edef68