[TOOLS][PLUGINS][OAuth2] Add mechanism to allow plugins to have an install script. Add script for generating keys for OAuth

plugins/OAuth2/bin/install.sh

@@ -0,0 +1,14 @@
+#!/bin/sh
+
+cd /var/www/social/file || exit 1
+
+mkdir -p oauth && cd oauth || exit 1
+
+if [ ! -f private.key ]; then
+    openssl genrsa -out private.key 4096
+    openssl rsa -in private.key -pubout -out public.key
+
+    chown www-data:www-data private.key public.key
+else
+    echo "Keys exist, nothing to do"
+fi