Revert changes for supporting unified-system-plugin package

Revert changes for supporting unified-system-plugin package

Since the 'run multiple services in one process' feature will be
implemented with united-service, previous implementations should be
removed.

This reverts commits below(old to new):
 * 658b9c42d61510d92c5c6204408d4ac63e6fe10e
 * cf796d0d87e7c077d1dc3c5d63b869e0c23c30d8
 * f83f717450de4f6d8b3921e2433d1cc78e88fca5
 * 01391b9fa57721a1d596c83c4e4ba076d03e4d5d

Change-Id: I9c1bf26a4900e27031c0681641049f9146469278
Signed-off-by: SangYoun Kwak <sy.kwak@samsung.com>