Update to upstream version '5.8.0'
with Debian dir bac4722236f32b42f11d70df2c18b02d1285e0e4

can be used to support XFRM interfaces on Linux 4.19+

strongswan-swanctl.service in strongswan-swanctl package has been
renamed to strongswan.service
strongswan.service in strongswan-starter package has been renamed to
strongswan-starter.service