Merge pull request #28 from hansode/clearup

add white spaces.
Merge pull request #29 from hansode/clearup

add new-lines to render_ifcfg.
fix bonding mapper arguments.
Merge pull request #30 from hansode/fix-bond-mapping

fix bonding mapper arguments.
define IFCFG_BOND_PARAMS.
Merge pull request #31 from hansode/refactor-bond-params

define IFCFG_BOND_PARAMS.
use if-statement.
Merge pull request #32 from hansode/if-statement

use if-statement.
integrate unset targets.
sort unset param order.