[oozie] Prepare statement should follow fs action convention

            <prepare>
                % for p in prepares:
                  <%
                    operation = p['type']
                    path = p['value']
                    
                    if not path.startswith('/'):                    
                      path = '/user/%(username)s/%(path)s' % {'username': '${wf:name()}', 'path': path}
                      
                    if not path.startswith('hdfs://'):
                      path = '%(nameNode)s%(path)s' % {'nameNode': '${nameNode}', 'path': path}          
                  %>
                  
                  <${ operation } path="${ path }"/>
                % endfor
            </prepare>

if path.startswith 'hdfs://':
  return path
elif not path.startswith '/':
  return '${nameNode}' + path
else:
  return '${nameNode}' + '/user/' + ${wf:name()} + '/' + path