Livy Interpreter does not handle string interpolation in Scala correctly due to dynamic forms

Livy interpreter does not handle correctly string interpolations of the form ${variable} in Scala, making jobs to fail.

As zjffdu pointed out in Zeppelin discussion thread of title "Livy interpreter Scala code string interpolation" :
"Spark only enable dynamic form for sql interpreter, while livy enable it for interpreters. This is the bug of livy interpreter."