disallow launching SequenceServer as `ruby sequenceserver.rb`
disallow launching SequenceServer as `ruby sequenceserver.rb`

We have an executable to launch SequenceServer now. Multiple entry points is
confusing and adds to the overall complexity.

Signed-off-by: Anurag Priyam <6e6ab5ea9cb59fe7c35d2a1fc74443577eb60635@gmail.com>

lepbase/lepbase-sequenceserver,IsmailM/sequenceserver,yeban/sequenceserver,jasminZ/sequenceserver,yeban/sequenceserver,deepakunni3/sequenceserver,IsmailM/sequenceserver,elsiklab/sequenceserver,vivekiitkgp/sequenceserver,vivekiitkgp/sequenceserver,deepakunni3/sequenceserver,jasminZ/sequenceserver,lepbase/lepbase-sequenceserver,elsiklab/sequenceserver,yeban/sequenceserver,aldermossy/sequenceserver,aldermossy/sequenceserver,elsiklab/sequenceserver,lepbase/lepbase-sequenceserver,vivekiitkgp/sequenceserver,jasminZ/sequenceserver,yeban/sequenceserver,deepakunni3/sequenceserver,aldermossy/sequenceserver,aldermossy/sequenceserver,IsmailM/sequenceserver