Added the use of tryWget() when requesting the update package

The tryWget(), included in common.sh, will automatically get the proxy
configuration and use the appropriate wget(1) to retrieve the update
package.

Signed-off-by: Vinicius Ruoso <vkr07@c3sl.ufpr.br>
Acked-by: Danilo Kiyoshi Simizu Yorinori <danilok@c3sl.ufpr.br>
Acked-by: Erik Alexandre Pucci <eap08@c3sl.ufpr.br>
Signed-off-by: Josiney de Souza <josineys@c3sl.ufpr.br>

agent.sh

@@ -53,18 +53,7 @@ function checkUpdate()
     if test $? -eq 4; then
         test -f "${TMPDIR}/SEED2-update.run" || rm -f ${TMPDIR}/SEED2-update.run
 
-        getProxyConf
-        if test -z "$phost"; then
-            PROXY=""
-        else
-            PROXY="http://${phost}:${pport}"
-        fi
-
-        http_proxy="${PROXY}" wget --tries=${UPDATETRIES} \
-                                   --timeout=${UPDATETIMEOUT} \
-                                   --proxy-user=${puid} \
-                                   --proxy-password=${ppasswd} \
-                                   ${UPDATESERVER}/SEED2-update.run \
+        tryWget ${UPDATESERVER}/SEED2-update.run \
                 -O ${TMPDIR}/SEED2-update.run || return 1
 
         cd ${TMPDIR}