slapos-testing: Provide environment with SLAPOS_TEST_*

Those values are free to be used by tests in order to obtain working
IPv4 and IPv6 addresses.

/reviewed-on !470

software/slapos-testing/buildout.hash.cfg

@@ -15,5 +15,5 @@
 
 [template]
 filename = instance.cfg
-md5sum = 2af05c83ea9525ac3c6816ee0365876c
+md5sum = 9c409e1eb2d45713579d65e350bc07e7
 

software/slapos-testing/instance.cfg

@@ -80,11 +80,14 @@ command-line =
 #   needs ping, which is a setuid binary that cannot be installed via slapos
 #   way of building software without root access, so we keep "standard"
 #   /usr/bin and /bin in $PATH
-# * LOCAL_IPV4 is needed for some slapos.core tests
+# * SLAPOS_TEST_environment is safe to be used by tests, but there is no
+#   guarantee about free ports on IPV4 and IPV6
+# * LOCAL_IPV4 is backward compatible, to be migrated, SLAPOS_TEST_IPV4
 environment =
   PATH=${coreutils:location}/bin:${curl:location}/bin:${openssl:location}/bin:${git:location}/bin:${libxslt:location}/bin:${socat:location}/bin:/usr/bin/:/bin/
   LOCAL_IPV4=$${slap-configuration:ipv4-random}
-  LOCAL_IPV6=$${slap-configuration:ipv6-random}
+  SLAPOS_TEST_IPV4=$${slap-configuration:ipv4-random}
+  SLAPOS_TEST_IPV6=$${slap-configuration:ipv6-random}
 
 
 [phantomjs-wrapper]