use 'mdbci destroy' instead of 'vagrant destroy' (#163)

use mdbci destroy instead of vagrant destroy

BUILD/mdbci/build.sh

@@ -66,9 +66,7 @@ $(<${script_dir}/templates/build.json.template)
 
 	# destroying existing box
 	if [ -d "$MDBCI_VM_PATH/${name}" ]; then
-		cd $MDBCI_VM_PATH/${name}
-		vagrant destroy -f
-		cd ${dir}
+		${mdbci_dir}/mdbci destroy $name
 	fi
 
 	# starting VM for build
@@ -78,9 +76,7 @@ $(<${script_dir}/templates/build.json.template)
 	${mdbci_dir}/mdbci up --attempts=1 $name
 	if [ $? != 0 ] ; then
 		echo "Error starting VM"
-		cd $MDBCI_VM_PATH/${name}
 		rm ~/vagrant_lock
-		cd $dir
 		exit 1
 	fi
 	echo "copying public keys to VM"
@@ -122,11 +118,7 @@ if [ "$try_already_running" == "yes" ] ; then
 fi
 if [[ "$do_not_destroy_vm" != "yes" && "$try_already_running" != "yes" ]] ; then
   echo "Destroying VM"
-  vagrant destroy -f
-  cd ..
-  rm -rf $name
-  rm -rf ${name}.json
-  rm -rf ${name}_netwotk_config
+  ${mdbci_dir}/mdbci destroy $name
 fi
 cd $dir
 

BUILD/mdbci/upgrade_test.sh

@@ -30,9 +30,7 @@ echo $JOB_NAME-$BUILD_NUMBER >> ~/vagrant_lock
 
 # destroying existing box
 if [ -d "install_$box" ]; then
-	cd $MDBCI_VM_PATH/$name
-	vagrant destroy -f
-	cd $dir
+        ${mdbci_dir}/mdbci destroy $name
 fi
 
 ${mdbci_dir}/repository-config/generate_all.sh repo.d
@@ -44,11 +42,9 @@ ${mdbci_dir}/mdbci up $name --attempts=1
 if [ $? != 0 ] ; then
         if [ $? != 0 ] ; then
 		echo "Error starting VM"
-		cd ${MDBCI_VM_PATH}/$name
 		if [ "x$do_not_destroy_vm" != "xyes" ] ; then
-			vagrant destroy -f
+                        ${mdbci_dir}/mdbci destroy $name
 		fi
-		cd $dir
 		rm ~/vagrant_lock
 		exit 1
 	fi
@@ -126,9 +122,7 @@ scp $scpopt $sshuser@$IP:/var/log/maxscale/* $logs_publish_dir
 chmod a+r $logs_publish_dir/*
 
 if [ "x$do_not_destroy_vm" != "xyes" ] ; then
-	cd $MDBCI_VM_PATH/$name
-	vagrant destroy -f
-	cd $dir
+        ${mdbci_dir}/mdbci destroy $name
 fi
 kill $pid_to_kill
 exit $res