Updated dependency module names in metadata.json to remove missing depen...

...dency warnings on 'puppet module list'

Hopefully this PR makes sense, it will get rid of the warnings generated on 'puppet module list'

Warning: Missing dependency 'nanliu-staging':
  'puppetlabs-tomcat' (v1.0.1) requires 'nanliu-staging' (>= 0.0.0)
Warning: Missing dependency 'puppetlabs-concat':
  'puppetlabs-tomcat' (v1.0.1) requires 'puppetlabs-concat' (>= 0.0.0)
Warning: Missing dependency 'puppetlabs-stdlib':
  'puppetlabs-tomcat' (v1.0.1) requires 'puppetlabs-stdlib' (>= 0.0.0)