Use bash for generated scripts
Use bash for generated scripts

Generated shell scripts for maven use a typical bash
if syntax which is not recognised by sh.
As a result the execution was failing on Gerrit CI.
(see [1])

Use bash as script interpreter to assure the correct
execution of the if statement.

[1]: https://goo.gl/3T5w5u

Change-Id: Id713a24d9cd6df145790769d014de6a66e64dace

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