HDDS-2231. test-single.sh cannot copy results

[adoroszlai]

What changes were proposed in this pull request?

Restore pre-HDDS-2185 behavior of test-single.sh by explicitly creating result directory.

https://issues.apache.org/jira/browse/HDDS-2231

How was this patch tested?

$ cd hadoop-ozone/dist/target/ozone-0.5.0-SNAPSHOT/compose/ozone
$ docker-compose up -d --scale datanode=3
$ ../test-single.sh scm basic/basic.robot
$ ls result
robot-ozone-ozone-basic-scm.xml

[adoroszlai]

/label ozone

[hadoop-yetus]

💔 -1 overall

Vote	Subsystem	Runtime	Comment
0	reexec	76	Docker mode activated.
		_ Prechecks _
+1	dupname	0	No case conflicting files found.
0	shelldocs	0	Shelldocs was not available.
+1	@author	0	The patch does not contain any @author tags.
-1	test4tests	0	The patch doesn't appear to include any new or modified tests. Please justify why no new tests are needed for this patch. Also please list what manual steps were performed to verify this patch.
		_ trunk Compile Tests _
-1	mvninstall	40	hadoop-hdds in trunk failed.
-1	mvninstall	42	hadoop-ozone in trunk failed.
+1	mvnsite	0	trunk passed
+1	shadedclient	808	branch has no errors when building and testing our client artifacts.
		_ Patch Compile Tests _
-1	mvninstall	40	hadoop-hdds in the patch failed.
-1	mvninstall	42	hadoop-ozone in the patch failed.
+1	mvnsite	0	the patch passed
+1	shellcheck	0	There were no new shellcheck issues.
+1	whitespace	0	The patch has no whitespace issues.
+1	shadedclient	717	patch has no errors when building and testing our client artifacts.
		_ Other Tests _
-1	unit	31	hadoop-hdds in the patch failed.
-1	unit	30	hadoop-ozone in the patch failed.
+1	asflicense	39	The patch does not generate ASF License warnings.
		1992

Subsystem	Report/Notes
Docker	Client=19.03.2 Server=19.03.2 base: https://builds.apache.org/job/hadoop-multibranch/job/PR-1575/1/artifact/out/Dockerfile
GITHUB PR	#1575
Optional Tests	dupname asflicense mvnsite unit shellcheck shelldocs
uname	Linux 657b4190d10b 4.15.0-60-generic #67-Ubuntu SMP Thu Aug 22 16:55:30 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	personality/hadoop.sh
git revision	trunk / 41440ec
mvninstall	https://builds.apache.org/job/hadoop-multibranch/job/PR-1575/1/artifact/out/branch-mvninstall-hadoop-hdds.txt
mvninstall	https://builds.apache.org/job/hadoop-multibranch/job/PR-1575/1/artifact/out/branch-mvninstall-hadoop-ozone.txt
mvninstall	https://builds.apache.org/job/hadoop-multibranch/job/PR-1575/1/artifact/out/patch-mvninstall-hadoop-hdds.txt
mvninstall	https://builds.apache.org/job/hadoop-multibranch/job/PR-1575/1/artifact/out/patch-mvninstall-hadoop-ozone.txt
unit	https://builds.apache.org/job/hadoop-multibranch/job/PR-1575/1/artifact/out/patch-unit-hadoop-hdds.txt
unit	https://builds.apache.org/job/hadoop-multibranch/job/PR-1575/1/artifact/out/patch-unit-hadoop-ozone.txt
Test Results	https://builds.apache.org/job/hadoop-multibranch/job/PR-1575/1/testReport/
Max. process+thread count	412 (vs. ulimit of 5500)
modules	C: hadoop-ozone/dist U: hadoop-ozone/dist
Console output	https://builds.apache.org/job/hadoop-multibranch/job/PR-1575/1/console
versions	git=2.7.4 maven=3.3.9 shellcheck=0.4.6
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[anuengineer]

Thank you for the contribution.

[adoroszlai]

Thanks @anuengineer for the review/commit.