Trying to make SocketTimeoutException’s (as originally noted in 3ec7e562) not...

Trying to make SocketTimeoutException’s (as originally noted in 3ec7e562) not turn into test errors. (Works only in JenkinsRule, not HudsonTestCase.) Still have no clue as to cause.

(cherry picked from commit 6fd76ea2)

Conflicts:
	test/src/main/java/org/jvnet/hudson/test/JenkinsRule.java