Change logical replication pg_hba.conf use

Logical replication no longer uses the "replication" keyword.  It just
matches database entries in the normal way.  The "replication" keyword
now only applies to physical replication.
Reviewed-by: Petr Jelinek <petr.jelinek@2ndquadrant.com>

doc/src/sgml/client-auth.sgml

@@ -193,7 +193,7 @@ hostnossl  <replaceable>database</replaceable>  <replaceable>user</replaceable>
        members of the role, directly or indirectly, and not just by
        virtue of being a superuser.
        The value <literal>replication</> specifies that the record
-       matches if a replication connection is requested (note that
+       matches if a physical replication connection is requested (note that
        replication connections do not specify any particular database).
        Otherwise, this is the name of
        a specific <productname>PostgreSQL</productname> database.

doc/src/sgml/logical-replication.sgml

@@ -295,11 +295,9 @@
   <title>Security</title>
 
   <para>
-   Logical replication connections occur in the same way as with physical streaming
-   replication.  It requires access to be explicitly given using
-   <filename>pg_hba.conf</filename>.  The role used for the replication
-   connection must have the <literal>REPLICATION</literal> attribute.  This
-   gives a role access to both logical and physical replication.
+   The role used for the replication connection must have
+   the <literal>REPLICATION</literal> attribute.  Access for the role must be
+   configured in <filename>pg_hba.conf</filename>.
   </para>
 
   <para>

src/backend/libpq/hba.c

@@ -612,9 +612,9 @@ check_db(const char *dbname, const char *role, Oid roleid, List *tokens)
 	foreach(cell, tokens)
 	{
 		tok = lfirst(cell);
-		if (am_walsender)
+		if (am_walsender && !am_db_walsender)
 		{
-			/* walsender connections can only match replication keyword */
+			/* physical replication walsender connections can only match replication keyword */
 			if (token_is_keyword(tok, "replication"))
 				return true;
 		}