Use consistent naming of components

Rename "pvcd" to "pvcnoded", and "pvc-api" to "pvcapid" so names for the
daemons are fully consistent. Update the names of the configuration
files as well to match this new formatting.

References #79

node-daemon/pvcnoded.service

@@ -0,0 +1,17 @@
+# Parallel Virtual Cluster node daemon unit file
+
+[Unit]
+Description = Parallel Virtual Cluster node daemon
+After = network-online.target zookeeper.service
+PartOf = pvc.target
+
+[Service]
+Type = simple
+WorkingDirectory = /usr/share/pvc
+Environment = PYTHONUNBUFFERED=true
+Environment = PVCD_CONFIG_FILE=/etc/pvc/pvcnoded.yaml
+ExecStart = /usr/share/pvc/pvcnoded.py
+Restart = on-failure
+
+[Install]
+WantedBy = pvc.target