1. Add new function to set gdbus connection, 2. Bug fix for EXIF info

1. Add new function to set gdbus connection, 2. Bug fix for EXIF info

1. Sometimes, got crashed when get gdbus connection,
so do not get gdbus connection in camera module and get from outside(muse server)
2. EXIF info is missed, fixed it.

[Version] 0.2.54
[Profile] Common
[Issue Type] Update and bug fix
[Dependency module] libmm-camcorder, mmsvc-core
[Test] [M(T) - Boot=(OK), sdb=(OK), Home=(OK), Touch=(OK), Version=tizen-mobile_20161024.2]

Change-Id: I628804ad3b6b612b61f1550dc1f103f52b20cdd5
Signed-off-by: Jeongmo Yang <jm80.yang@samsung.com>