Change needed to add header blocks to all Dockerfiles, similar to the
base.
Use case is to easily run something before packages are installed, e.g.
to COPY a local rpm in that can be added to the package list.
Change-Id: I1bbfdf0b762da0a392aa8bf47781315b45377bee
Closes-Bug: 1618969
Is a best practice in Unix/Linux scripts to use dots
instead of source command.
Using dots will avoid issues with non BASH shells
TrivialFix
Change-Id: Ie6480a1954f853f79faffa093452715ebd9f7d90
Signed-off-by: Eduardo Gonzalez <dabarren@gmail.com>