Provide full hostname with domainname to underlying container layer
Addresses #7851

Docker-DCO-1.1-Signed-off-by: Phil Estes <estesp@linux.vnet.ibm.com> (github: estesp)
builder: Fix handling of VOLUME command where multiple volumes are
specified in a space delimited list.

Docker-DCO-1.1-Signed-off-by: Erik Hollensbe <github@hollensbe.org> (github: erikh)
Merge pull request #7994 from erikh/parser_fix_volume_parsing

builder: Fix handling of VOLUME command where multiple volumes are specified in a space delimited list.
Merge pull request #8208 from estesp/7851-fix-hostname-fqdn

Provide full hostname with domainname to underlying container layer
Adding details on how to use .dockerignore file
Addresses #7724

Signed-off-by: Srini Brahmaroutu <srbrahma@us.ibm.com>