Don't assume source and binary directories are the same

Some of the scripts assumed that other scripts would be located in the
same directory where the current script was executed.

Also fixed the SSL connection creation which depended on an obsolete
environment variable causing all out-of-source SSL tests to fail.

maxscale-system-test/cache_basic.sh

@@ -1,5 +1,8 @@
 #!/bin/bash
 
+rp=`realpath $0`
+export src_dir=`dirname $rp`
+
 user=skysql
 password=skysql
 
@@ -15,18 +18,20 @@ function run_test
     local test_name=$1
 
     echo $test_name
+    logdir=log_$test_name
+    mkdir -p $logdir
 
     mysqltest --host=$maxscale_IP --port=$port \
               --user=$user --password=$password \
-              --logdir=log \
-              --test-file=t/$test_name.test \
-              --result-file=r/$test_name.result \
+              --logdir=$logdir \
+              --test-file=$dir/t/$test_name.test \
+              --result-file=$dir/r/$test_name.result \
               --silent
 
     if [ $? -eq 0 ]
     then
         echo " OK"
-	rc=0
+	    rc=0
     else
         echo " FAILED"
         rc=1
@@ -57,7 +62,9 @@ then
     echo "warning: Expected test name to be $expected_name_basic, was $1."
 fi
 
-source=cache/$1/cache_rules.json
+export dir="$src_dir/cache/$expected_name"
+
+source=$src_dir/cache/$1/cache_rules.json
 target=vagrant@$maxscale_IP:/home/$maxscale_access_user/cache_rules.json
 
 if [ $maxscale_IP != "127.0.0.1" ] ; then
@@ -78,11 +85,6 @@ test_dir=`pwd`
 
 $test_dir/non_native_setup $1
 
-cd cache/$expected_name
-
-[ -d log ] && rm -r log
-mkdir log || exit 1
-
 echo
 
 # We sleep slightly longer than the TTL to ensure that the TTL mechanism