Can celect Ceilometer as a monitoring server.

This version, however, can't register the ceilometer target without
passive mode. I'll fix it in the next step.
[server] Pass paramters about OpenStack services to HapProcessCeilometer.
[DBTablesConfig] Add a new method: getServerType().
[DBTablesConfig] Add a new test: test_getServerTypeExpectFalse().
[DBTablesConfig] Use a prefix with the same manner of brotherly definitions.
[DBTablesConfig] Add a new column: pluginPath in server_types.
[DBTablesConfig] Move getDefaultPluginPath to DBTablesConfig.

This methods is used only from Hathol server (not Arm Plugin).
So it's natural to be under 'src' directory.
[RestResourceServer] Save dbName if it's specified.

We're planning to add new ArmPlugins. And we allow them to
used dbName column as they like.

For example, Arm Plugin for OpenStack's ceilometer uses it for
saving a tenant name.
[mk-server-type-sql] Generate the standard Arm Plugin names for the tables: server_types.
Merge pull request #576 from project-hatohol/server-type-database-2a

A new monitoring system: ceilometer