Use qcow2 by default for savevm, loadvm.

Create shortcuts for -t linux-reconfigure and -t host-qemu-reconfigure.

build

@@ -7,7 +7,7 @@ j="$(($(nproc) - 2))"
 post_script_args=''
 x11=false
 v=0
-while getopts 'a:j:p:St:v' OPT; do
+while getopts 'a:j:lp:qSt:v' OPT; do
   case "$OPT" in
     a)
       arch="$OPTARG"
@@ -15,9 +15,15 @@ while getopts 'a:j:p:St:v' OPT; do
     j)
       j="$OPTARG"
     ;;
+    l)
+      extra_targets="$extra_args linux-reconfigure"
+    ;;
     p)
       post_script_args="$OPTARG"
     ;;
+    q)
+      extra_targets="$extra_args host-qemu-reconfigure"
+    ;;
     S)
       qemu_sdl=''
     ;;