vip-process: rework vip-agent

vip-process: rework vip-agent

vip-process now constructs vip configurations from each vip packages,
not from resourced itself. Each vip packages now define and install
vip configuration file at /etc/resourced/vip-process.d, and resourced
collects these configuration files. The format of new configuration
file is like below, and more option might be added in the future.

  [VIP_GROUP1]          // Section format: VIP_GROUP#
                           There can be multiple vip groups.
			   If there is only one group, then just
			   [VIP_GROUP] is possible.

  PROCESS=some_binary1 // Define vip processes.
  PROCESS=some_binary2
  ...

  SERVICE=some_unit1.service // Define vip services.
  SERVICE=some_unit2.service
  ...

  ACTION_ON_FAILURE=reboot  // Define action for the vip group.
                            // Currently only "reboot" is supported.

  [VIP_GROUP2]
  ...

Change-Id: I4d88f59a009a5a7800651a07f79ab37f2cfae719
Signed-off-by: Youngjae Cho <y0.cho@samsung.com>