HADOOP-16319 skip invalid tests when default encryption enabled

[ben-roling]

ETag values are unpredictable with some encryption algorithms. Skip tests asserting ETags when default encryption is enabled.

[hadoop-yetus]

🎊 +1 overall

Vote	Subsystem	Runtime	Comment
0	reexec	507	Docker mode activated.
		_ Prechecks _
+1	dupname	0	No case conflicting files found.
+1	@author	0	The patch does not contain any @author tags.
+1	test4tests	0	The patch appears to include 1 new or modified test files.
		_ trunk Compile Tests _
+1	mvninstall	1067	trunk passed
+1	compile	34	trunk passed
+1	checkstyle	24	trunk passed
+1	mvnsite	39	trunk passed
+1	shadedclient	692	branch has no errors when building and testing our client artifacts.
+1	javadoc	27	trunk passed
0	spotbugs	59	Used deprecated FindBugs config; considering switching to SpotBugs.
+1	findbugs	58	trunk passed
		_ Patch Compile Tests _
+1	mvninstall	31	the patch passed
+1	compile	31	the patch passed
+1	javac	31	the patch passed
+1	checkstyle	17	the patch passed
+1	mvnsite	33	the patch passed
+1	whitespace	0	The patch has no whitespace issues.
+1	shadedclient	752	patch has no errors when building and testing our client artifacts.
+1	javadoc	20	the patch passed
+1	findbugs	61	the patch passed
		_ Other Tests _
+1	unit	266	hadoop-aws in the patch passed.
+1	asflicense	25	The patch does not generate ASF License warnings.
		3782

Subsystem	Report/Notes
Docker	Client=17.05.0-ce Server=17.05.0-ce base: https://builds.apache.org/job/hadoop-multibranch/job/PR-836/1/artifact/out/Dockerfile
GITHUB PR	#836
Optional Tests	dupname asflicense mvnsite compile javac javadoc mvninstall unit shadedclient findbugs checkstyle
uname	Linux 07b98714516a 4.4.0-138-generic #164-Ubuntu SMP Tue Oct 2 17:16:02 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	personality/hadoop.sh
git revision	trunk / 24c53e0
Default Java	1.8.0_212
Test Results	https://builds.apache.org/job/hadoop-multibranch/job/PR-836/1/testReport/
Max. process+thread count	411 (vs. ulimit of 5500)
modules	C: hadoop-tools/hadoop-aws U: hadoop-tools/hadoop-aws
Console output	https://builds.apache.org/job/hadoop-multibranch/job/PR-836/1/console
versions	git=2.7.4 maven=3.3.9 findbugs=3.1.0-RC1
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[ben-roling]

With regard to testing: I've only run this one test class before and after the change. It is successfully skipping the tests that were previously failing when default encryption was enabled on the bucket. I did not run the full suite since there were no changes that could affect other test classes.

My tests were performed against us-west-2.

[steveloughran]

we need to get this in, don't we?

[steveloughran]

merged to trunk. Thanks!