ctclient: accept "get-entries" as synonym for "getentries"
ctclient: accept "get-entries" as synonym for "getentries"

This is consistent with accepting "get-roots" as a synonym for "getroots".

daviddrysdale/certificate-transparency-go,RJPercival/certificate-transparency-go,RJPercival/certificate-transparency-go,daviddrysdale/certificate-transparency-go,RJPercival/certificate-transparency-go,google/certificate-transparency-go,daviddrysdale/certificate-transparency-go,google/certificate-transparency-go,google/certificate-transparency-go