pgpool2: Added a new recipe.

Pgpool-II is a middleware that works between PostgreSQL servers and a PostgreSQL database client. It is distributed under a license similar to BSD and MIT. It provides the  following features.

Signed-off-by: Lei Maohui <leimaohui@fujitsu.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

meta-networking/recipes-support/pgpool2/pgpool2/0001-Fix-build-error-when-build-this-file.patch

@@ -0,0 +1,32 @@
+From f8ab74a76049f69adeebe92c62593547e05a075d Mon Sep 17 00:00:00 2001
+From: Lei Maohui <leimaohui@fujitsu.com>
+Date: Wed, 11 Jan 2023 17:22:41 +0900
+Subject: [PATCH] Fix build error when build this file.
+
+| snprintf.c:770:64: error: 'PG_STRERROR_R_BUFLEN' undeclared (first use in this function)
+|   770 |                                         char            errbuf[PG_STRERROR_R_BUFLEN];
+|       |                                                                ^~~~~~~~~~~~~~~~~~~~
+
+PG_STRERROR_R_BUFLEN is defined in postgresql, but pgpool doesn't
+include the header of postgresql.
+
+Upstream-Status: Inappropriate [OE-Specific]
+Signed-off-by: Lei Maohui <leimaohui@fujitsu.com>
+---
+ src/parser/snprintf.c | 1 +
+ 1 file changed, 1 insertion(+)
+
+diff --git a/src/parser/snprintf.c b/src/parser/snprintf.c
+index 84ebdb2..3387897 100644
+--- a/src/parser/snprintf.c
++++ b/src/parser/snprintf.c
+@@ -46,6 +46,7 @@
+ #include "pool_parser.h"
+ #include "stringinfo.h"
+ #include "utils/palloc.h"
++#include "postgresql/server/port.h"
+
+ /*
+  * We used to use the platform's NL_ARGMAX here, but that's a bad idea,
+--
+2.25.1

meta-networking/recipes-support/pgpool2/pgpool2/0001-pgpool2-Fix-unknown-type-name-fd_set-error-with-musl.patch

@@ -0,0 +1,33 @@
+From 5d335b5ddd052f047759cae0e9b94ec49f9f3884 Mon Sep 17 00:00:00 2001
+From: Lei Maohui <leimaohui@fujitsu.com>
+Date: Mon, 20 Mar 2023 02:03:04 +0000
+Subject: [PATCH] pgpool2: Fix unknown type name 'fd_set' error with musl.
+
+| read.c: In function 'read_until_ready_for_query':
+| read.c:53:24: error: storage size of 'timeoutval' isn't known
+|    53 |         struct timeval timeoutval;
+|       |                        ^~~~~~~~~~
+| read.c:54:9: error: unknown type name 'fd_set'
+|    54 |         fd_set          readmask;
+|       |         ^~~~~~
+
+Upstream-Status: Inappropriate [embedded specific]
+Signed-off-by: Lei Maohui <leimaohui@fujitsu.com>
+---
+ src/tools/pgproto/read.c | 1 +
+ 1 file changed, 1 insertion(+)
+
+diff --git a/src/tools/pgproto/read.c b/src/tools/pgproto/read.c
+index c7fb548..4efe641 100644
+--- a/src/tools/pgproto/read.c
++++ b/src/tools/pgproto/read.c
+@@ -19,6 +19,7 @@
+ #include "../../include/config.h"
+ #include "pgproto/pgproto.h"
+ #include <unistd.h>
++#include <sys/select.h>
+ #include <stdlib.h>
+ #include <stdio.h>
+ #include <string.h>
+--
+2.34.1

meta-networking/recipes-support/pgpool2/pgpool2/pgpool.service

@@ -0,0 +1,17 @@
+[Unit]
+Description=Pgpool-II
+After=syslog.target network.target
+
+[Service]
+
+User=postgres
+Group=postgres
+
+EnvironmentFile=-/etc/sysconfig/pgpool
+
+ExecStart=/usr/bin/pgpool -f /etc/pgpool-II/pgpool.conf $OPTS
+ExecStop=/usr/bin/pgpool -f /etc/pgpool-II/pgpool.conf $STOP_OPTS stop
+ExecReload=/usr/bin/pgpool -f /etc/pgpool-II/pgpool.conf reload
+
+[Install]
+WantedBy=multi-user.target

meta-networking/recipes-support/pgpool2/pgpool2/pgpool.sysconfig

@@ -0,0 +1,7 @@
+# Options for pgpool
+
+# -n: don't run in daemon mode. does not detach control tty
+# -d: debug mode. lots of debug information will be printed
+
+#OPTS=" -d -n"
+OPTS=" -n"