cozy-monitor status errors

[aenario]

Improve errors for cozy-monitor status

Cant get app list is not accurate enough, it should debug the following cases :

• couchdb.login doesnt exists / wrong chmod
• controller doesnt have proper token vs DS
• ect ...

[poupotte]

Error logs for status command should be improved in next version :)

[clochix]

I stopped the data-system, and the message is much clearer now:

error - The Cozy Data System looks not started
error - The Cozy Home looks not started
error - Cannot retrieve apps
error - An error occured:
error - Cannot display status
[Error: Error: Parsing error : Unexpected token I, body= 
 Internal Server Error]

Thanks @poupotte :-)