dist/common/scripts/scylla_bootparam_setup: support EC2 paravirtual instances
dist/common/scripts/scylla_bootparam_setup: support EC2 paravirtual instances

EC2 paravirtual instances uses pv-grub, which refers /boot/grub/menu.lst (grub0.9x config file) instead of grub2 config file.
So add boot parameters on /boot/grub/menu.lst when the file exists, and the instance is on EC2.

Fixes #1598

Signed-off-by: Takuya ASADA <4ebfb6f510af412d6e89fefa3ab96d9c8b5e3fff@scylladb.com>
Message-Id: <1472056875-17512-1-git-send-email-4ebfb6f510af412d6e89fefa3ab96d9c8b5e3fff@scylladb.com>

avikivity/scylla,scylladb/scylla,scylladb/scylla,duarten/scylla,raphaelsc/scylla,duarten/scylla,avikivity/scylla,raphaelsc/scylla,scylladb/scylla,avikivity/scylla,scylladb/scylla,raphaelsc/scylla,duarten/scylla