Bug-4448: Dump binary columns in hexadecimal notation not working and hex_for_blob -> hex_for_binary

Signed-off-by: Chirayu Chiripal <chirayu.chiripal@gmail.com>
Merge pull request #1218 from D-storm/bug-4448

Bug-4448: Dump binary columns in hexadecimal notation not working
Fix merge conflict

Signed-off-by: Marc Delisle <marc@infomarc.info>
Merge commit '478a105'