obs/slapos: use shorter name to have less chance to have a shebang too long

obs/slapos/release_configuration.sh

@@ -16,6 +16,6 @@ OBS_DIRECTORY=$CURRENT_DIRECTORY/home:VIFIBnexedi:branches:home:VIFIBnexedi/Slap
 VERSION_REGEX="s/\%RECIPE_VERSION\%/$RECIPE_VERSION/g;s/\%VERSION\%/$VERSION/g;s/\%RELEASE\%/$RELEASE/g"
 TEMPLATES_DIRECTORY=$CURRENT_DIRECTORY/templates
 SLAPOS_ORGINAL_DIRECTORY=slapos-node
-SLAPOS_DIRECTORY=slapos-node_$VERSION+$RECIPE_VERSION+$RELEASE
+SLAPOS_DIRECTORY=sn_$VERSION+$RECIPE_VERSION+$RELEASE
 
 export SSL_CERT_FILE=/etc/ssl/certs/ca-certificates.crt