erp5testnode: Upgrade erp5.util to 0.4.50

It provides fix to call correct endpoints (Distributor instead of a Tool).

/reviewed-on nexedi/slapos!260

software/erp5testnode/software.cfg

@@ -58,7 +58,7 @@ mode = 0644
 
 [versions]
 PyXML = 0.8.5
-erp5.util = 0.4.49
+erp5.util = 0.4.50
 slapos.recipe.template = 4.1
 ipython = 5.3.0
 apache-libcloud = 2.1.0

software/erp5testnode/testsuite/deploy-test/software.cfg

@@ -71,4 +71,4 @@ output = ${buildout:directory}/template.cfg
 mode = 0644
 
 [versions]
-erp5.util = 0.4.49
+erp5.util = 0.4.50