[doc] Add missing required packages

add missing required packages for octavia doc when build images
trivial fix

Change-Id: I4f10fdcbaa128fdb8d64c1490896ec6e29928f3c

doc/source/reference/networking/octavia.rst

@@ -45,13 +45,13 @@ It is necessary to build an Amphora image. On CentOS / RHEL 8:
 .. code-block:: console
 
    sudo dnf -y install epel-release
-   sudo dnf install -y debootstrap
+   sudo dnf install -y debootstrap qemu-img git e2fsprogs policycoreutils-python-utils
 
 On Ubuntu:
 
 .. code-block:: console
 
-   sudo apt -y install debootstrap
+   sudo apt -y install debootstrap qemu-utils git kpartx
 
 Acquire the Octavia source code: