Remove support for enabling file injection

File injection is disabled in nova meanwhile, and devstack core
reviewers think it shouldn't be configureable in devstack anymore.
This basically reverts https://review.openstack.org/#/c/70560/

Change-Id: Ia7dd407da00c0b1c9641865aea1f7b74533d7357
diff --git a/lib/nova_plugins/hypervisor-libvirt b/lib/nova_plugins/hypervisor-libvirt
index f70b21a..f52629d 100644
--- a/lib/nova_plugins/hypervisor-libvirt
+++ b/lib/nova_plugins/hypervisor-libvirt
@@ -25,9 +25,6 @@
 # Defaults
 # --------
 
-# File injection is disabled by default in Nova.  This will turn it back on.
-ENABLE_FILE_INJECTION=$(trueorfalse False ENABLE_FILE_INJECTION)
-
 
 # Entry Points
 # ------------
@@ -60,17 +57,9 @@
         iniset $NOVA_CONF DEFAULT vnc_enabled "false"
     fi
 
-    if [[ "$ENABLE_FILE_INJECTION" = "True" ]] ; then
-        # When libguestfs is available for file injection, enable using
-        # libguestfs to inspect the image and figure out the proper
-        # partition to inject into.
-        iniset $NOVA_CONF libvirt inject_partition '-1'
-        iniset $NOVA_CONF libvirt inject_key 'true'
-    else
-        # File injection is being disabled by default in the near future -
-        # disable it here for now to avoid surprises later.
-        iniset $NOVA_CONF libvirt inject_partition '-2'
-    fi
+    # File injection is being disabled by default in the near future -
+    # disable it here for now to avoid surprises later.
+    iniset $NOVA_CONF libvirt inject_partition '-2'
 
     if [[ "$LIBVIRT_TYPE" = "parallels" ]]; then
         iniset $NOVA_CONF libvirt connection_uri "parallels+unix:///system"
@@ -96,14 +85,6 @@
             yum_install libcgroup-tools
         fi
     fi
-
-    if [[ "$ENABLE_FILE_INJECTION" = "True" ]] ; then
-        if is_ubuntu; then
-            install_package python-guestfs
-        elif is_fedora || is_suse; then
-            install_package python-libguestfs
-        fi
-    fi
 }
 
 # start_nova_hypervisor - Start any required external services