Refactor get_openbsd() to add create_vm() compatibility

quickget

@@ -1017,15 +1017,10 @@ function get_nixos() {
 
 function get_openbsd() {
     local HASH=""
-    local ISO=""
+    local ISO="install${RELEASE//\./}.iso"
-    local URL=""
+    local URL="https://cdn.openbsd.org/pub/OpenBSD/${RELEASE}/amd64"
-
-    URL="https://cdn.openbsd.org/pub/OpenBSD/${RELEASE}/amd64"
-    ISO="install${RELEASE//\./}.iso"
     HASH=$(wget -q -O- "${URL}/SHA256" | grep "${ISO}" | cut -d' ' -f4)
-    web_get "${URL}/${ISO}" "${VM_PATH}"
+    echo "${URL}/${ISO} ${HASH}"
-    check_hash "${ISO}" "${HASH}"
-    make_vm_config "${ISO}"
 }
 
 function get_opensuse() {