statsd: add a chance to set hostname and port in hydra.conf

Co-authored-by: Graham Christensen <graham@grahamc.com>

t/Config/statsd.t

@@ -0,0 +1,61 @@
+use strict;
+use Setup;
+
+my %ctx = test_init(hydra_config => q|
+<statsd>
+  host = foo.bar
+  port = 18125
+</statsd>
+|);
+
+require Hydra::Helper::Nix;
+use Test2::V0;
+
+is(Hydra::Helper::Nix::getStatsdConfig(Hydra::Helper::Nix::getHydraConfig()), {
+    'host' => "foo.bar",
+    'port' => 18125
+}, "Reading specific configuration from the hydra.conf works");
+
+is(Hydra::Helper::Nix::getStatsdConfig(), {
+    'host' => "localhost",
+    'port' => 8125
+}, "A totally empty configuration yields default options");
+
+is(Hydra::Helper::Nix::getStatsdConfig({
+    "statsd" => {
+
+    }
+}), {
+    'host' => "localhost",
+    'port' => 8125
+}, "A empty statsd block yields default options");
+
+is(Hydra::Helper::Nix::getStatsdConfig({
+    "statsd" => {
+        'host' => "statsdhost"
+    }
+}), {
+    'host' => "statsdhost",
+    'port' => 8125
+}, "An overridden statsd host propogates, but the other defaults are returned");
+
+is(Hydra::Helper::Nix::getStatsdConfig({
+    "statsd" => {
+        'port' => 5218
+    }
+}), {
+    'host' => "localhost",
+    'port' => 5218
+}, "An overridden statsd port propogates, but the other defaults are returned");
+
+is(Hydra::Helper::Nix::getStatsdConfig({
+    "statsd" => {
+        'host' => 'my.statsd.host',
+        'port' => 5218
+    }
+}), {
+    'host' => "my.statsd.host",
+    'port' => 5218
+}, "An overridden statsd port and host propogate");
+
+done_testing;