Protocol_simple->Protocol_text; Protocol_prep->Protocol_binary
and also THD::protocol_simple->THD::protocol_text,
THD::protocol_prep->THD::protocol_binary.
Reason: the binary protocol is not bound to be used only with
prepared statements long term (see WL#3559 "Decouple binary protocol
from prepared statements"). Renaming now is pressing because
the fix for BUG#735 "Prepared Statements: there is
no support for Query Cache" will introduce a new member
in class Query_cache_flags telling about the protocol's nature.
Other reason: "simple" is less accurate than "text".
Future patches for BUG#735 will rely on this cset.


libmysqld/lib_sql.cc:
  Protocol_simple->Protocol_text; Protocol_prep->Protocol_binary
sql/protocol.cc:
  Protocol_simple->Protocol_text; Protocol_prep->Protocol_binary
sql/protocol.h:
  Protocol_simple->Protocol_text; Protocol_prep->Protocol_binary
sql/set_var.cc:
  Protocol_simple->Protocol_text; Protocol_prep->Protocol_binary
sql/sql_class.cc:
  Protocol_simple->Protocol_text; Protocol_prep->Protocol_binary
sql/sql_class.h:
  Protocol_simple->Protocol_text; Protocol_prep->Protocol_binary
sql/sql_prepare.cc:
  Protocol_simple->Protocol_text; Protocol_prep->Protocol_binary