Revert "bfd: T3753: FRR 8.1 uses a default echo-interval of 50 - reflect this in CLI"
Revert "bfd: T3753: FRR 8.1 uses a default echo-interval of 50 - reflect this in CLI"

This reverts commit 49047b88c9bac0b2e007ccce7ac7d42e82ee0a2b.

>  Echo mode is only available for single hop sessions

vyos/vyos-1x,vyos/vyos-1x,vyos/vyos-1x,vyos/vyos-1x