eigrp: T2472: remove smoketest
Commit 0eb4168aa ("eigrp: T2472: improve code for later tests") added a basic
smoketest for EIGRP, which is also run by the CI hence not having a +x bit at
all.
This just deletes the basic smoketest testing for ASN and EIGRP router-id.
We can revert it once it's fixed in FRR upstream.