CP-52334 MVD - add -d option to mock driver-tool (#6595)

The API supports a driver deselect call for which Xapi calls the
underlying driver-tool. The mock driver is missing the corresponding -d
option, which this patch adds. This fixes an internal error that Xapi
raises otherwise.

An alternative would be to ignore the error from the driver-tool.

Author: lindig

ocaml/xapi/xapi_host_driver_tool.ml

@@ -243,6 +243,15 @@ module Mock = struct
 set -o errexit
 set -o pipefail
 
+function deselect {
+  cat <<EOF
+{
+  "driver": "$1",
+  "exit": 0
+}
+EOF
+}
+
 function selection {
   cat <<EOF
 {
@@ -253,6 +262,7 @@ function selection {
 EOF
 }
 
+
 function list() {
   cat <<EOF
 
@@ -606,9 +616,10 @@ l_flag=false
 s_flag=false
 n_value=""
 v_value=""
+d_value=""
 
 # Use getopt to parse command-line options
-while getopts "lsn:v:" opt; do
+while getopts "lsn:v:d:" opt; do
   case "$opt" in
     l)
       l_flag=true
@@ -622,6 +633,9 @@ while getopts "lsn:v:" opt; do
     v)
       v_value="$OPTARG"
       ;;
+    d)
+      d_value="$OPTARG"
+      ;;
     \?)  # Invalid option
       echo "Invalid option: -$OPTARG" >&2  #>&2 redirects error message to stderr
       exit 1
@@ -656,6 +670,11 @@ if $s_flag; then
   selection "$n_value" "$v_value"
   exit 0
 fi
+
+if [ -n "$d_value" ]; then
+  deselect "$d_value"
+  exit 0
+fi
 |}
 
   let install () =