Add support for ReadThreads parameter

This change also increases the default parameter's value for the remote
collectd service because usually it collects more metrics than the local
collectd service.
diff --git a/metadata/service/remote_client/cluster.yml b/metadata/service/remote_client/cluster.yml
index b340e79..b1d8d34 100644
--- a/metadata/service/remote_client/cluster.yml
+++ b/metadata/service/remote_client/cluster.yml
@@ -7,5 +7,6 @@
     remote_client:
       enabled: true
       read_interval: 10
+      read_threads: 10
       use_fqdn: false
       automatic_starting: false
diff --git a/metadata/service/remote_client/single.yml b/metadata/service/remote_client/single.yml
index 81062b4..297912a 100644
--- a/metadata/service/remote_client/single.yml
+++ b/metadata/service/remote_client/single.yml
@@ -7,5 +7,6 @@
     remote_client:
       enabled: true
       read_interval: 10
+      read_threads: 10
       use_fqdn: false
       automatic_starting: true