Combine Plugin Steps

Combine Plugin Steps

StepRunParserPlugin combines below steps
 - StepRegisterPluginInfo
 - StepUpdatePluginInfo
 - StepUnregisterPluginInfo

Related changes
    [app-installers] https://review.tizen.org/gerrit/#/c/platform/core/appfw/app-installers/+/204652/
    [tpk-backend] https://review.tizen.org/gerrit/#/c/platform/core/appfw/tpk-backend/+/204757/
    [wgt-backend] https://review.tizen.org/gerrit/#/c/platform/core/appfw/wgt-backend/+/205385/

Change-Id: Ib430c9b0c71c82fc2ccf73e4af8bd1f3db66a470
Signed-off-by: Ilho Kim <ilho159.kim@samsung.com>