Increase ssh connection timeout to 30 seconds

The previous 5-second timeout causes random errors during compilation
here, increasing it to 30 seconds solves this problem.

libexec/copy-from-target

@@ -47,7 +47,7 @@ if [ $# = 0 ] ; then
 fi
 
 if [ -z "$USE_LXC" ]; then
-    scp $QUIET_FLAG -oConnectTimeout=5 -oNoHostAuthenticationForLocalhost=yes -i ${GITIAN_BASE:-.}/var/id_dsa -P $VM_SSH_PORT -r $TUSER@localhost:$1 $2
+    scp $QUIET_FLAG -oConnectTimeout=30 -oNoHostAuthenticationForLocalhost=yes -i ${GITIAN_BASE:-.}/var/id_dsa -P $VM_SSH_PORT -r $TUSER@localhost:$1 $2
 else
     config-lxc
     sudo lxc-start -n gitian -f var/lxc.config -- sudo -i -u $TUSER tar -cf - "$1" | tar -C "$2" -xkf -

libexec/copy-to-target

@@ -47,7 +47,7 @@ if [ $# = 0 ] ; then
 fi
 
 if [ -z "$USE_LXC" ]; then
-    scp $QUIET_FLAG -r -oConnectTimeout=5 -oNoHostAuthenticationForLocalhost=yes -i ${GITIAN_BASE:-.}/var/id_dsa -P $VM_SSH_PORT $1 $TUSER@localhost:$2
+    scp $QUIET_FLAG -r -oConnectTimeout=30 -oNoHostAuthenticationForLocalhost=yes -i ${GITIAN_BASE:-.}/var/id_dsa -P $VM_SSH_PORT $1 $TUSER@localhost:$2
 else
     config-lxc
     tar -C `dirname "$1"` -cf - `basename "$1"` | sudo lxc-start -n gitian -f var/lxc.config -- sudo -i -u $TUSER tar -C "$2" -xf -

libexec/on-target

@@ -42,7 +42,7 @@ fi
 #fi
 
 if [ -z "$USE_LXC" ]; then
-    ssh -oConnectTimeout=5 -oNoHostAuthenticationForLocalhost=yes -i ${GITIAN_BASE:-.}/var/id_dsa -p $VM_SSH_PORT $TUSER@localhost $*
+    ssh -oConnectTimeout=30 -oNoHostAuthenticationForLocalhost=yes -i ${GITIAN_BASE:-.}/var/id_dsa -p $VM_SSH_PORT $TUSER@localhost $*
 else
     config-lxc
     if [ $TUSER = "root" ]; then