MDEV-15409 make sure every sst script is tested in buildbot

* make galera.galera_sst_xtrabackup* not big
* auto-select between socat and nc, whatever available
* auto-skip xtrabackup tests if no xtrabackup or neither socat nor nc

mysql-test/suite/galera/include/have_xtrabackup.inc

+#
+# suite.pm will make sure that all tests including this file
+# will be skipped as needed
+#

mysql-test/suite/galera/suite.pm

-package My::Suite::GALERA;
+package My::Suite::Galera;
 use File::Basename;
 use My::Find;
 
@@ -25,6 +25,8 @@ return "No scritps" unless $cpath;
 my ($epath) = grep { -f "$_/my_print_defaults"; } "$::bindir/extra", $::path_client_bindir;
 return "No my_print_defaults" unless $epath;
 
+sub which($) { return `sh -c "command -v $_[0]"` }
+
 push @::global_suppressions,
   (
      qr(WSREP: wsrep_sst_receive_address is set to '127.0.0.1),
@@ -82,5 +84,19 @@ $ENV{PATH}="$epath:$ENV{PATH}";
 $ENV{PATH}="$spath:$ENV{PATH}" unless $epath eq $spath;
 $ENV{PATH}="$cpath:$ENV{PATH}" unless $cpath eq $spath;
 
-bless { };
+if (which(socat)) {
+  $ENV{MTR_GALERA_TFMT}='socat';
+} elsif (which(nc)) {
+  $ENV{MTR_GALERA_TFMT}='nc';
+}
 
+sub skip_combinations {
+  my %skip = ();
+  $skip{'include/have_xtrabackup.inc'} = 'Need innobackupex'
+             unless which(innobackupex);
+  $skip{'include/have_xtrabackup.inc'} = 'Need socat or nc'
+             unless $ENV{MTR_GALERA_TFMT};
+  %skip;
+}
+
+bless { };

mysql-test/suite/galera/t/galera_autoinc_sst_xtrabackup.test

@@ -6,6 +6,7 @@
 --source include/big_test.inc
 --source include/galera_cluster.inc
 --source include/have_innodb.inc
+--source include/have_xtrabackup.inc
 
 --connection node_1
 --let $connection_id = `SELECT CONNECTION_ID()`

mysql-test/suite/galera/t/galera_ist_xtrabackup-v2.test

 --source include/big_test.inc
 --source include/galera_cluster.inc
 --source include/have_innodb.inc
+--source include/have_xtrabackup.inc
 
 --source suite/galera/include/galera_st_disconnect_slave.inc
 --source suite/galera/include/galera_st_shutdown_slave.inc

mysql-test/suite/galera/t/galera_sst_xtrabackup-v2-options.cnf

@@ -22,3 +22,4 @@ parallel=2
 encrypt=1
 encrypt-algo=AES256
 encrypt-key=4FA92C5873672E20FB163A0BCB2BB4A4
+transferfmt=@ENV.MTR_GALERA_TFMT

mysql-test/suite/galera/t/galera_sst_xtrabackup-v2-options.test

@@ -3,9 +3,9 @@
 # Initial SST happens via xtrabackup, so there is not much to do in the body of the test
 #
 
---source include/big_test.inc
 --source include/galera_cluster.inc
 --source include/have_innodb.inc
+--source include/have_xtrabackup.inc
 
 SELECT 1;
 

mysql-test/suite/galera/t/galera_sst_xtrabackup-v2.cnf

@@ -11,3 +11,5 @@ wsrep_provider_options='base_port=@mysqld.1.#galera_port;gcache.size=1;pc.ignore
 [mysqld.2]
 wsrep_provider_options='base_port=@mysqld.2.#galera_port;gcache.size=1;pc.ignore_sb=true'
 
+[sst]
+transferfmt=@ENV.MTR_GALERA_TFMT

mysql-test/suite/galera/t/galera_sst_xtrabackup-v2.test

---source include/big_test.inc
 --source include/galera_cluster.inc
 --source include/have_innodb.inc
+--source include/have_xtrabackup.inc
 
 # Save original auto_increment_offset values.
 --let $node_1=node_1

mysql-test/suite/galera/t/galera_sst_xtrabackup-v2_encrypt_with_key.cnf

@@ -9,3 +9,4 @@ wsrep_debug=ON
 tkey=@ENV.MYSQL_TEST_DIR/std_data/galera-key.pem
 tcert=@ENV.MYSQL_TEST_DIR/std_data/galera-cert.pem
 encrypt=3
+transferfmt=@ENV.MTR_GALERA_TFMT

mysql-test/suite/galera/t/galera_sst_xtrabackup-v2_encrypt_with_key.test

@@ -6,6 +6,7 @@
 --source include/big_test.inc
 --source include/galera_cluster.inc
 --source include/have_innodb.inc
+--source include/have_xtrabackup.inc
 
 SELECT 1;