improve OS preparation, change config structure
diff --git a/configs/config.yaml b/configs/config.yaml
index a5a4b16..522fcd3 100644
--- a/configs/config.yaml
+++ b/configs/config.yaml
@@ -22,19 +22,34 @@
 internal:
     var_dir_root: /tmp/perf_tests
 
+vm_configs:
+    wally_1024:
+        image:
+            name: wally_ubuntu
+            url: https://cloud-images.ubuntu.com/trusty/current/trusty-server-cloudimg-amd64-disk1.img
+            creds: "ssh://ubuntu@{ip}::{private_key_path}"
+
+        flavor:
+            name: wally_1024
+            hdd_size: 50
+            ram_size: 1024
+            cpu_count: 1
+
+        vol_sz: 30
+        keypair_name: wally_vm_key
+        name_templ: wally-{group}-{id}
+        aa_group_name: wally-aa-{0}
+        security_group: wally_ssh_to_everyone
+
 tests:
     - start_test_nodes:
         openstack:
-            creds: clouds
-            vm_params:
-                count: x2
-                img_name: disk_io_perf
-                flavor_name: disk_io_perf.256
-                keypair_name: disk_io_perf
-                network_zone_name: novanetwork
-                flt_ip_pool: nova
-                creds: "ssh://ubuntu@{0}::disk_io_perf.pem"
-                name_templ: disk_io_perf-{0}
+            creds: /tmp/perf_tests/personalistic_sharron/test_openrc
+            count: x1
+            cfg_name: wally_1024
+            network_zone_name: net04
+            flt_ip_pool: net04_ext
+
         tests:
             - io:
                 cfg: tests/io_scenario_hdd.cfg