add option to use sudo with non privileged user

sample.xo-install.cfg

@@ -2,6 +2,16 @@
 # default: root
 #XOUSER=
 
+# Optional parameter if running as non privileged user to use sudo when mounting/umounting shares inside Xen Orchestra
+# no effect if XOUSER is root
+# options true/false
+#USESUDO=false
+
+# Optional parameter to generate sudoers config when missing completely if USESUDO is set to true
+# no effect if XOUSER is root
+# options true/false
+#GENSUDO=false
+
 # Port number where xen-orchestra service is bound
 PORT="80"