core: minor cleanup in VdsUpdateRunTimeInfo

- Replace documentation comments within methods with single line
  comments.
- Replace fields initializations which consist of two consecutive
  statements - one for declaration + null assignment and another
  one for value assignment, with one initialization statement
  which include the field declaration plus value assignment.
- Change private method names that begin with upper-case letter
  to start with lower case letter

Change-Id: I21cc745d9034cbf97b1d39ad65a96c30c01e7dd2
Signed-off-by: Arik Hadas <ahadas@redhat.com>