fix help message for mkimage debootstrap with components

debootstrap needs the suite as the second argument, for this the script
reorders arguments beginning with a minus but components separated by
space, as stated by the help message, is not handled and will lead to
the rootfs being passed as suite to debootstrap.
The poor mans solution is to fix the help message to pass the long
option as one argument.

Signed-off-by: Julian Taylor <jtaylor.debian@googlemail.com>
Print a status message when pull command is executed
Using repo tag in the status message for better usability, as per review comments
Added documentation and Changed code to print Status after downloads are complete

Addresses #2404

Signed-off-by: Srini Brahmaroutu <srbrahma@us.ibm.com>
Merge pull request #8346 from juliantaylor/mkimage-debootstrap

fix help message for mkimage debootstrap with components
Merge pull request #8213 from brahmaroutu/pull_status_2404

Print a status message when pull command is executed