Description of problem:
The manual page for getent doesn't list the ahosts database.  More databases
might be missing.

Steps to Reproduce:
1. man getent | grep -C 1 ethers
  
Actual results:
       database using the specified search keys.  Where database is one of
       aliases, ethers, group, hosts, netgroup, networks, passwd, protocols,
       rpc, services or shadow.

Expected results:
Complete list of databases, including ahosts, in particular.