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 #8213 from brahmaroutu/pull_status_2404

Print a status message when pull command is executed