Add GRUB configuration to Ansible role

roles/base/templates/etc/default/grub.j2

@@ -0,0 +1,9 @@
+# GRUB configuration
+# {{ ansible_managed }}
+GRUB_DEFAULT=0
+GRUB_TIMEOUT=5
+GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
+GRUB_CMDLINE_LINUX="{{ grub_cmdline }}"
+GRUB_TERMINAL_INPUT="console serial"
+GRUB_TERMINAL_OUTPUT="gfxterm serial"
+GRUB_SERIAL_COMMAND="{{ grub_serial }}"