MDEV-14978 fix client.client-env-variable test

* fix paths to work when installed and not only from the source dir
* don't use a cnf file (no need to restart the server for this)
* set MYSQL_HOST to a valid hostname when testing an invalid MARIADB_HOST
* use invalid ip to have clients fail quickly and not waste time
  on resolving the invalid hostname

followup for eedbb90

Author: vuvova

mysql-test/suite/client/client-env-variable.cnf

@@ -2,6 +2,6 @@ USE test;
 CREATE TABLE pet (name VARCHAR(20));
 localhost
 ****************
-nonexistent-server
+255.255.255.255
 Done
 DROP TABLE pet;

mysql-test/suite/client/client-env-variable.result

@@ -4,14 +4,13 @@
 # The environment variables for client programs have default options file
 # They interfere with the MTR test so I am creating new variables for them
 
---let MARIADB = $MYSQL_BINDIR/client//mariadb
---let MARIADBADMIN = $MYSQL_BINDIR/client//mariadb-admin
---let MARIADBBINLOG = $MYSQL_BINDIR/client//mariadb-binlog
---let MARIADBCHECK = $MYSQL_BINDIR/client//mariadb-check
---let MARIADBDUMP = $MYSQL_BINDIR/client//mariadb-dump
---let MARIADBIMPORT = $MYSQL_BINDIR/client//mariadb-import
---let MARIADBSHOW = $MYSQL_BINDIR/client//mariadb-show
---let MARIADBSLAP = $MYSQL_BINDIR/client//mariadb-slap
+--let MARIADBADMIN = $EXE_MYSQL-admin
+--let MARIADBBINLOG = $EXE_MYSQL-binlog
+--let MARIADBCHECK = $EXE_MYSQL-check
+--let MARIADBDUMP = $EXE_MYSQL-dump
+--let MARIADBIMPORT = $EXE_MYSQL-import
+--let MARIADBSHOW = $EXE_MYSQL-show
+--let MARIADBSLAP = $EXE_MYSQL-slap
 
 # Creating a table for the client programs
 USE test;
@@ -26,12 +25,12 @@ EOF
 # Options for client program
 --let $options = --user=root --port=$MASTER_MYPORT --disable-ssl-verify-server-cert
 
-# Check to see if environment variable is defined
-# MARIADB_HOST is defined in client-env-variable.cnf
+# Positive test for client program with MARIADB_HOST
+--let MARIADB_HOST=localhost
+--let MYSQL_HOST=nonexistent-server
 --echo $MARIADB_HOST
 
-# Positive test for client program with MARIADB_HOST
---exec $MARIADB $options -e "SHOW DATABASES;" > /dev/null 2>&1
+--exec $EXE_MYSQL $options -e "SHOW DATABASES;" > /dev/null 2>&1
 --exec $MARIADBADMIN $options processlist > /dev/null 2>&1
 --exec $MARIADBBINLOG $options --read-from-remote-server master-bin.000001 > /dev/null 2>&1
 --exec $MARIADBCHECK $options -c --databases test > /dev/null 2>&1
@@ -42,15 +41,16 @@ EOF
 
 #Set up negative test with invalid server
 --echo ****************
---let MARIADB_HOST=nonexistent-server
+--let MARIADB_HOST=255.255.255.255
+--let MYSQL_HOST=localhost
 --echo $MARIADB_HOST
 
 # Now run the same command as in the postive test case
 # Client programs are expected to fail since the server does not exist
 # Some client program fails with error 1 and some fails wtih error 2
 
 --error 1
---exec $MARIADB $options -e "SHOW DATABASES;" > /dev/null 2>&1
+--exec $EXE_MYSQL $options -e "SHOW DATABASES;" > /dev/null 2>&1
 
 --error 1
 --exec $MARIADBADMIN $options processlist > /dev/null 2>&1
@@ -71,7 +71,7 @@ EOF
 --exec $MARIADBSLAP $options > /dev/null 2>&1
 
 # Run the same command but with '--host' to verify command line input overrides env variable
---exec $MARIADB $options --host localhost -e "SHOW DATABASES;" > /dev/null 2>&1
+--exec $EXE_MYSQL $options --host localhost -e "SHOW DATABASES;" > /dev/null 2>&1
 --exec $MARIADBADMIN $options --host localhost processlist > /dev/null 2>&1
 --exec $MARIADBBINLOG $options --host localhost --read-from-remote-server master-bin.000001 > /dev/null 2>&1
 --exec $MARIADBCHECK $options --host localhost -c --databases test > /dev/null 2>&1