Make HPC2N script a bit more self-contained

7 jobs for master in 29 minutes and 4 seconds (queued for 1 second)
Status Job ID Name Coverage
  Build
passed #4811
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build:trusty

00:07:28

passed #4812
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build:trusty-cmake3.5.0

00:07:22

passed #4813
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build:xenial

00:03:16

passed #4814
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build:xenial-fsanitize

00:02:32

 
  Test
passed #4815
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test:trusty

00:03:16

passed #4816
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test:trusty-cmake3.5.0

00:03:31

passed #4817
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test:xenial

00:01:37