version up to 0.5.81, including below changes:

version up to 0.5.81, including below changes:
- added NULL check for avoiding crash
- fixed svace issue (release resource and pipe issue)
- reg db will not be updated when the re-request is same
- fixed issue daemon cannot get notification
- added package event listener for being uninstalled package

Change-Id: Ic65d96210af9a5cd355382763f31e11835beacbf
Signed-off-by: Ickhee Woo <ickhee.woo@samsung.com>