catch internal ZK exceptions for groomer
Merge pull request #1645 from AppScale/fix-groomer

catch internal ZK exceptions for groomer
fixed missing reference and added resource limits
forgot to import resource
use actualy zk
catch appscale db connection error
added check for deleted journal entries
Merge pull request #1646 from AppScale/fix-groomer

fixed missing reference and added resource limits
Check if Java lib dir is present, create if it is missing.
Run pylint.
Fixing appengine-web.xml regex to reflect AS tools side functionality.
Added more checks.
Changes log message level.
Merge pull request #1648 from menivaitsi/deploy-regex

Java deploy regex and lib dir checks.