Remove deprecated Ruby consul-client library (#4419)
Remove deprecated Ruby consul-client library (#4419)

The GitHub repo for this library says that it is no longer maintained
and should not be used. The Ruby Diplomat library provides similar
functionality instead (and is already listed here).
42wim/consul,calgaryscientific/consul,42wim/consul,hashicorp/consul,hashicorp/consul,scalp42/consul,scalp42/consul,youhong316/consul,youhong316/consul,calgaryscientific/consul,kingland/consul,calgaryscientific/consul,vamage/consul,youhong316/consul,youhong316/consul,vamage/consul,42wim/consul,kingland/consul,kingland/consul,calgaryscientific/consul,scalp42/consul,42wim/consul,vamage/consul,hashicorp/consul,calgaryscientific/consul,youhong316/consul,vamage/consul,kingland/consul,hashicorp/consul,vamage/consul,scalp42/consul,kingland/consul,42wim/consul,scalp42/consul