[SPARK-6720][MLLIB] PySpark MultivariateStatisticalSummary unit test for normL1...

[Lewuathe]

... and normL2.
Add test cases to insufficient unit test for normL1 and normL2.

Ref: #5359

[SparkQA]

Test build #29740 has started for PR 5374 at commit dc5718c.

[SparkQA]

Test build #29740 has finished for PR 5374 at commit dc5718c.

• This patch passes all tests.
• This patch merges cleanly.
• This patch adds no public classes.
• This patch does not change any dependencies.

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Test PASSed.
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[mengxr]

The bounds are too loose. We should reach machine precision for this.

import math
expectedNormL2 = math.sqrt(sum(map(lambda x: x*x, xrange(10))))
self.assertTrue(math.abs(summary2.normL2()[0] - expectedNormL2) < 1e-14)

[SparkQA]

Test build #29791 has started for PR 5374 at commit 5541b24.

[SparkQA]

Test build #29791 has finished for PR 5374 at commit 5541b24.

• This patch passes all tests.
• This patch merges cleanly.
• This patch adds no public classes.
• This patch does not change any dependencies.

[AmplabJenkins]

Test PASSed.
Refer to this link for build results (access rights to CI server needed):
https://amplab.cs.berkeley.edu/jenkins//job/SparkPullRequestBuilder/29791/
Test PASSed.

[mengxr]

LGTM. Merged into master. Thanks!