cli now supports --long-opts. improved help / usage information

metrics/disk_io.sh

@@ -37,5 +37,5 @@ terminate () {
 
 docs () {
   echo "Disk I/O in MB/s."
-  echo "\$DISK_IO_MOUNTPOINT=$DISK_IO_MOUNTPOINT"
+  echo "\$DISK_IO_MOUNTPOINT="
 }

metrics/disk_usage.sh

@@ -17,5 +17,5 @@ collect () {
 
 docs () {
   echo "Disk usage percentage for a file system at a given mount point."
-  echo "\$DISK_USAGE_MOUNTPOINT=$DISK_USAGE_MOUNTPOINT"
+  echo "\$DISK_USAGE_MOUNTPOINT="
 }

metrics/network_io.sh

@@ -39,5 +39,5 @@ collect () {
 
 docs () {
   echo "Network traffic in kB/s."
-  echo "\$NETWORK_IO_INTERFACE=$NETWORK_IO_INTERFACE"
+  echo "\$NETWORK_IO_INTERFACE="
 }