appliance: Fix build.sh to build 64bit systemvm appliance as well

TODO: Make it general like boxer.sh in tools/devcloud/src

Signed-off-by: Rohit Yadav <bhaisaab@apache.org>

tools/appliance/README.md

@@ -43,7 +43,7 @@ Note, gem may require gcc-4.2, make sure link exists:
 Just run build.sh, it will export archived appliances for KVM, Xen,
 VMWare and HyperV in `dist`:
 
-    sh build.sh
+    sh build.sh [systemvmtemplate|systemvmtemplate64]
 
 # Building SystemVM template appliance manually
 
@@ -51,7 +51,7 @@ List available appliances one can build:
 
     veewee vbox list
 
-Modify scripts in definitions/systemvmtemplate/ as per needs.
+Modify scripts in definitions/*appliance*/ as per needs.
 Build systemvm template appliance:
 
     veewee vbox build 'systemvmtemplate'

tools/appliance/build.sh

@@ -18,7 +18,13 @@
 
 set -x
 
-appliance="systemvmtemplate"
+if [ "$1"!="" ]
+then
+  appliance="$1"
+else
+  appliance="systemvmtemplate"
+fi
+
 build_date=`date +%Y-%m-%d`
 branch="master"
 rootdir=$PWD