Support config files in a folder

[ninjapapa]

Currently we supports 4 type of configurations other than the default values:

Priority: Low to High

• default
• conf/smv-app-conf.props
• ${HOME}/.smv/smv-user-conf.props
• conf/smv-user-conf.props
• command-line

As adding the connection concept, to avoid making existing config files too complicated, we will support config files in folders. A structure this issue should support is:

• conf
  • smv-app-conf.props
  • smv-user-conf.props
  • connections
    • all_hdfs_conns.props
    • all_hive_conns.props

And all config files in folders are at the same priority level as smv-app-conf.pros.

[ninjapapa]

@AliTajeldin please review the plan.

[AliTajeldin]

Do we need a folder hierarchy? How about hard code the file name such as connections.props. A single project will probably not have too many connections. We can read/write them all at once anytime once changes.