setup:script: Changed default path for sstate_cache

The old path provokes problems with the auto generated mount services
for our buildservers.

setup-environment

@@ -46,8 +46,8 @@ GF_IMAGES="$(find sources/meta-seconorth-distro/recipes-bsp/images/ -iname "*.bb
                 -exec basename -s ".bb" {} \;)"
 
 DL_DIR_GLOBAL="/usr/src/packages/"
-SSTATE_DIR="/var/cache/yocto/sstate-cache"
-SSTATE_MIRROR="/var/cache/yocto/sstate-cache"
+SSTATE_DIR="/var/cache/yocto/sstate_cache"
+SSTATE_MIRROR="/var/cache/yocto/sstate_cache"
 
 MESSAGES=""
 message()