use the value of --pack-to option as filename to match all outputs

use the value of --pack-to option as filename to match all outputs

AS-IS:
$ sudo mic cr loop PLATFORM.ks --release SNAPSHOT --pack-to IMAGENAME.tar.gz
  IMAGENAME.tar.gz
  IMAGENAME.xml
  SNAPSHOT-PLATFORM.packages
  SNAPSHOT-PLATFORM.files
  SNAPSHOT-PLATFORM.license
  SNAPSHOT-PLATFORM.ks
  ...

TO-BE:
$ sudo mic cr loop PLATFORM.ks --release SNAPSHOT --pack-to IMAGENAME.tar.gz
  IMAGENAME.tar.gz
  IMAGENAME.xml
  IMAGENAME.packages
  IMAGENAME.files
  IMAGENAME.license
  IMAGENAME.ks
  ...

Change-Id: I5cc148a09b3e4cc4ed863100f0fde4df362038cd
Signed-off-by: Dohyung Kim <dohyung2.kim@samsung.com>