pgsql: Add a message type header to the CopyData messages sent from - Mailing list pgsql-committers

Log Message:
-----------
Add a message type header to the CopyData messages sent from primary
to standby in streaming replication. While we only have one message type
at the moment, adding a message type header makes this easier to extend.

Modified Files:
--------------
    pgsql/doc/src/sgml:
        protocol.sgml (r1.77 -> r1.78)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/protocol.sgml?r1=1.77&r2=1.78)
    pgsql/src/backend/replication:
        walreceiver.c (r1.2 -> r1.3)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/replication/walreceiver.c?r1=1.2&r2=1.3)
        walsender.c (r1.4 -> r1.5)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/replication/walsender.c?r1=1.4&r2=1.5)
    pgsql/src/backend/replication/libpqwalreceiver:
        libpqwalreceiver.c (r1.2 -> r1.3)

(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/replication/libpqwalreceiver/libpqwalreceiver.c?r1=1.2&r2=1.3)
    pgsql/src/include/replication:
        walreceiver.h (r1.5 -> r1.6)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/include/replication/walreceiver.h?r1=1.5&r2=1.6)