Update snitch registration EC2Snitch --> Ec2Snitch
Update snitch registration EC2Snitch --> Ec2Snitch

Update EC2Snitch to Ec2Snitch, org.apache.cassandra.locator.EC2Snitch to
org.apache.cassandra.locator.Ec2Snitch

Signed-off-by: Shlomi Livne <6f01bf2e882e3bb6371d28d1418e5f729e7183e6@scylladb.com>

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