logrotate: replace fedorahosted.org SRC_URI with github.com source

logrotate: replace fedorahosted.org SRC_URI with github.com source

fedorahosted.org was retired on March 1st, 2017. This is to
update the SRC_URI to point to github.com.
Update the ${PN} to ${BPN} in order to pass the autobuilder
mulitlib enable configuration.

[YOCTO #11226]

Signed-off-by: Choong YinThong <yin.thong.choong@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Signed-off-by: Armin Kuster <akuster808@gmail.com>