cql3: Remove some unsued methods
cql3: Remove some unsued methods

They are removed because they are not used anywhere
and they contain code that would have to be modified
in the following commits.

Signed-off-by: Jan Ciolek <b66a6f3989e26cb552db14b7ab163c3a50292e24@scylladb.com>

scylladb/scylla,scylladb/scylla,scylladb/scylla,scylladb/scylla