Fix error message for invalid conduit mapping

Print the name of the problematic network, instead of the Ruby Object.

(cherry picked from commit cdbdca03140e5aa84ff514388dceeefb00f99be9)
fixup! Fix error message for invalid conduit mapping

(cherry picked from commit e4e845f069839fe25d31f7e35a86d733381fa8a4)
Merge pull request #297 from rhafer/roxy-log

Fix error message for invalid conduit mapping