Make list of application commands lexicographically ordered for help command in interactive mode.
Make list of application commands lexicographically ordered for help command in interactive mode.

Before fix:
Application commands (type help <topic>):
=========================================
files  two part  list files  simple  show file  file  error  help

After fix:
Application commands (type help <topic>):
=========================================
error  file  files  help  list files  show file  simple  two part

varunarya10/cliff,citrix-openstack-build/cliff,dtroyer/cliff,idjaw/cliff,openstack/cliff,dtroyer/cliff,idjaw/cliff,varunarya10/cliff,enzochiau/cliff,openstack/cliff,citrix-openstack-build/cliff,enzochiau/cliff