MT#17213 Fix 3831f7: Revert testrunner changes which prevent fetching new goss file after NGCP upgrade

After upgrade new goss file is not downloaded (because old one exist)
while tests have new syntax for new NGCP version:
> 16:12:19 + ssh -t -t 192.168.23.138 'SKIP_STRICT_HOSTNAME_TEST=false      SKIP_DNS_CHECK_TEST=false      GOSS_NOCOLOR=true      /usr/share/ngcp-tests/testrunner ce'
> ...
> 16:12:23 2016-03-18 16:12:23: Generating /etc/ngcp-tests/pro/goss.json: OK
> 16:12:23 Error: json: cannot unmarshal number into Go value of type string

P.S. yes, we need package here with proper dependencies in system-tests

Change-Id: If22655f306582f2056810d75eeb55e19e96fdbdf

testrunner

@@ -20,16 +20,16 @@ case "${TYPE}" in
   *) echo "ERRRO: Unknown type '$1'" >&2 ; usage >&2 ; exit 1 ;;
 esac
 
-if [ ! -x "/usr/sbin/goss" ] ; then
-  goss="goss-mika-git804995a8_with_tap_and_junit"
+goss="goss-mika-git804995a8_with_tap_and_junit"
 
+if [ ! -x "/usr/sbin/${goss}" ] ; then
   echo "Downloading goss and installing as /usr/sbin/${goss}"
   curl -L "https://deb.sipwise.com/files/${goss}" > "/usr/sbin/${goss}"
   chmod +x "/usr/sbin/${goss}"
-
-  ln -sf "/usr/sbin/${goss}" /usr/sbin/goss
 fi
 
+rm -f /usr/sbin/goss
+ln -s "/usr/sbin/${goss}" /usr/sbin/goss
 
 host_yml_file="/etc/ngcp-config/config.$(hostname).yml"
 if [ -n "${SKIP_DNS_CHECK_TEST}" ] || [ -n "${SKIP_STRICT_HOSTNAME_TEST}" ] ; then