Fix clean.sh to clean the host when there is no DBs to clean, e.g. MB run in single host
Fix clean.sh to clean the host when there is no DBs to clean, e.g. MB run in single host

asankasanjaya/stratos,apache/stratos,agentmilindu/stratos,lasinducharith/stratos,hsbhathiya/stratos,apache/stratos,gayangunarathne/stratos,pkdevbox/stratos,asankasanjaya/stratos,asankasanjaya/stratos,apache/stratos,apache/stratos,lasinducharith/stratos,dinithis/stratos,gayangunarathne/stratos,anuruddhal/stratos,dinithis/stratos,asankasanjaya/stratos,hsbhathiya/stratos,Thanu/stratos,asankasanjaya/stratos,gayangunarathne/stratos,apache/stratos,pkdevbox/stratos,hsbhathiya/stratos,Thanu/stratos,pubudu538/stratos,pkdevbox/stratos,anuruddhal/stratos,pkdevbox/stratos,agentmilindu/stratos,pkdevbox/stratos,lasinducharith/stratos,gayangunarathne/stratos,pubudu538/stratos,ravihansa3000/stratos,pubudu538/stratos,gayangunarathne/stratos,ravihansa3000/stratos,agentmilindu/stratos,hsbhathiya/stratos,ravihansa3000/stratos,ravihansa3000/stratos,Thanu/stratos,Thanu/stratos,lasinducharith/stratos,anuruddhal/stratos,gayangunarathne/stratos,pubudu538/stratos,apache/stratos,lasinducharith/stratos,ravihansa3000/stratos,pkdevbox/stratos,dinithis/stratos,hsbhathiya/stratos,lasinducharith/stratos,Thanu/stratos,dinithis/stratos,agentmilindu/stratos,ravihansa3000/stratos,dinithis/stratos,ravihansa3000/stratos,agentmilindu/stratos,pubudu538/stratos,anuruddhal/stratos,hsbhathiya/stratos,Thanu/stratos,Thanu/stratos,pubudu538/stratos,hsbhathiya/stratos,dinithis/stratos,anuruddhal/stratos,asankasanjaya/stratos,apache/stratos,asankasanjaya/stratos,agentmilindu/stratos,lasinducharith/stratos,anuruddhal/stratos,dinithis/stratos,pubudu538/stratos,pkdevbox/stratos,gayangunarathne/stratos,agentmilindu/stratos,anuruddhal/stratos