Increase streaming server timeout  (#22280)
Increase streaming server timeout  (#22280)

* Increase streaming server timeout to give tests a chance to complete before service teardown. Locally seems to help with Spark 2 tests

* Try an insanely long timeout to see if the Spark Context dies or gets killed.

Co-authored-by: Byron Ellis <3d8f96242f9f47b4dff119b0ffce89a1f136f9a2@google.com>
apache/beam,lukecwik/incubator-beam,apache/beam,apache/beam,lukecwik/incubator-beam,chamikaramj/beam,lukecwik/incubator-beam,chamikaramj/beam,chamikaramj/beam,chamikaramj/beam,chamikaramj/beam,chamikaramj/beam,chamikaramj/beam,apache/beam,chamikaramj/beam,lukecwik/incubator-beam,apache/beam,chamikaramj/beam,lukecwik/incubator-beam,apache/beam,chamikaramj/beam,lukecwik/incubator-beam,apache/beam,apache/beam,lukecwik/incubator-beam,apache/beam,apache/beam,lukecwik/incubator-beam,lukecwik/incubator-beam,lukecwik/incubator-beam,apache/beam