BUG-571: Add default output base directory for generated sources as compile root folder for maven project
in sal code generator.

Fixes: maven compilation fails with default outputBaseDir option.

Signed-off-by: Maros Marsalek <mmarsale@cisco.com>
Change-Id: Ia6d84079dbb76eac5fcfbd29d93b451c0f7e14f9
(cherry picked from commit 9cb78c0e0e0b9ac1c2aaf7d8617a20b1932e6782)