IM test suite fix.

Log messages from shell-scripts were put to var/log/<test id>.log
file. Now, this file is used by mysql-test-run.pl. So, move log
messages to var/log/<test id>.script.log.

mysql-test/t/kill_n_check.sh

@@ -53,7 +53,7 @@ pid_path="$1"
 expected_result="$2"
 total_timeout="$3"
 test_id="$4"
-log_file="$MYSQLTEST_VARDIR/log/$test_id.log"
+log_file="$MYSQLTEST_VARDIR/log/$test_id.script.log"
 
 log_debug "-- $basename: starting --"
 log_debug "pid_path: '$pid_path'"

mysql-test/t/log.sh

@@ -17,7 +17,7 @@ if [ $# -lt 2 ]; then
 fi
 
 test_id="$1"
-log_file="$MYSQLTEST_VARDIR/log/$test_id.log"
+log_file="$MYSQLTEST_VARDIR/log/$test_id.script.log"
 
 shift
 

mysql-test/t/wait_for_process.sh

@@ -63,7 +63,7 @@ pid_path="$1"
 total_attempts="$2"
 event="$3"
 test_id="$4"
-log_file="$MYSQLTEST_VARDIR/log/$test_id.log"
+log_file="$MYSQLTEST_VARDIR/log/$test_id.script.log"
 
 log_debug "-- $basename: starting --"
 log_debug "pid_path: '$pid_path'"

mysql-test/t/wait_for_socket.sh

@@ -30,7 +30,7 @@ password="$4"
 db="$5"
 total_timeout="$6"
 test_id="$7"
-log_file="$MYSQLTEST_VARDIR/log/$test_id.log"
+log_file="$MYSQLTEST_VARDIR/log/$test_id.script.log"
 
 log_debug "-- $basename: starting --"
 log_debug "client_exe: '$client_exe'"