fix: use .DNSNames instead of .Aliases in tests

Docker has changed their output in an unclear manner, but this is the correct way to check for what dns records are available for usage by apps.

Author: josegonzalez

tests/link_networks.bats

@@ -48,7 +48,7 @@ teardown() {
   assert_output_contains bridge 0
   assert_output_contains custom-network
 
-  run docker inspect dokku.$PLUGIN_COMMAND_PREFIX.ls -f '{{range $net,$v := .NetworkSettings.Networks}}{{range $k,$alias := $v.Aliases}}{{printf "alias:%s\n" $alias}}{{end}}{{end}}'
+  run docker inspect dokku.$PLUGIN_COMMAND_PREFIX.ls -f '{{range $net,$v := .NetworkSettings.Networks}}{{range $k,$alias := $v.DNSNames}}{{printf "alias:%s\n" $alias}}{{end}}{{end}}'
   echo "output: $output"
   echo "status: $status"
   assert_success
@@ -120,7 +120,7 @@ teardown() {
   assert_output_contains custom-network
   assert_output_contains bridge
 
-  run docker inspect dokku.$PLUGIN_COMMAND_PREFIX.ls -f '{{range $net,$v := .NetworkSettings.Networks}}{{range $k,$alias := $v.Aliases}}{{printf "alias:%s\n" $alias}}{{end}}{{end}}'
+  run docker inspect dokku.$PLUGIN_COMMAND_PREFIX.ls -f '{{range $net,$v := .NetworkSettings.Networks}}{{range $k,$alias := $v.DNSNames}}{{printf "alias:%s\n" $alias}}{{end}}{{end}}'
   echo "output: $output"
   echo "status: $status"
   assert_success
@@ -192,7 +192,7 @@ teardown() {
   assert_output_contains bridge
   assert_output_contains custom-network
 
-  run docker inspect dokku.$PLUGIN_COMMAND_PREFIX.ls -f '{{range $net,$v := .NetworkSettings.Networks}}{{range $k,$alias := $v.Aliases}}{{printf "alias:%s\n" $alias}}{{end}}{{end}}'
+  run docker inspect dokku.$PLUGIN_COMMAND_PREFIX.ls -f '{{range $net,$v := .NetworkSettings.Networks}}{{range $k,$alias := $v.DNSNames}}{{printf "alias:%s\n" $alias}}{{end}}{{end}}'
   echo "output: $output"
   echo "status: $status"
   assert_success
@@ -258,7 +258,7 @@ teardown() {
   assert_output_contains bridge
   assert_output_contains custom-network
 
-  run docker inspect dokku.$PLUGIN_COMMAND_PREFIX.lsa -f '{{range $net,$v := .NetworkSettings.Networks}}{{range $k,$alias := $v.Aliases}}{{printf "alias:%s\n" $alias}}{{end}}{{end}}'
+  run docker inspect dokku.$PLUGIN_COMMAND_PREFIX.lsa -f '{{range $net,$v := .NetworkSettings.Networks}}{{range $k,$alias := $v.DNSNames}}{{printf "alias:%s\n" $alias}}{{end}}{{end}}'
   echo "output: $output"
   echo "status: $status"
   assert_success