Using 'cp -a' to install files in do_install function leaks user/group
attributes from build machine to target packages.
WARNING: log_check: There is a warn message in the logfile
WARNING: log_check: Matched keyword: [warn]
WARNING: log_check: warning: user xxxxx does not exist - using root
Signed-off-by: Javier Viguera <javier.viguera@digi.com> Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>