[unpackfs] Add tests

- Add global- and job-configurations for test runs.
 - Add a driver script that sets up some assumptions on the host
   system so that the tests can complete.
 - The idea is that these tests together get a decent code-coverage
   for the module.

src/modules/unpackfs/runtests.sh

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+#! /bin/sh
+SRCDIR=$( dirname "$0" )
+
+# For test 3
+mkdir /tmp/unpackfs-test-run-rootdir3
+
+# For test 7
+mkdir /tmp/unpackfs-test-run-rootdir3/realdest
+
+# Run tests
+sh "$SRCDIR/../testpythonrun.sh" unpackfs
+
+# Cleanup test 7
+rm -rf /tmp/unpackfs-test-run-rootdir3/realdest
+
+# Cleanup test 3
+rmdir /tmp/unpackfs-test-run-rootdir3

src/modules/unpackfs/tests/1.global

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+---
+bogus: true

src/modules/unpackfs/tests/2.global

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+---
+rootMountPoint: /tmp/unpackfs-test-run-rootdir/

src/modules/unpackfs/tests/3.global

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+---
+rootMountPoint: /tmp/unpackfs-test-run-rootdir3/

src/modules/unpackfs/tests/3.job

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+---
+unpack: []

src/modules/unpackfs/tests/4.global

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+---
+rootMountPoint: /tmp/unpackfs-test-run-rootdir3/

src/modules/unpackfs/tests/4.job

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+---
+unpack:
+   - source: .
+     sourcefs: bogus

src/modules/unpackfs/tests/5.global

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+---
+rootMountPoint: /tmp/unpackfs-test-run-rootdir3/

src/modules/unpackfs/tests/5.job

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+---
+unpack:
+   - source: ./fakesource
+     sourcefs: ext4
+     destination: fakedest

src/modules/unpackfs/tests/6.global

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+---
+rootMountPoint: /tmp/unpackfs-test-run-rootdir3/

src/modules/unpackfs/tests/6.job

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+---
+unpack:
+   - source: .
+     sourcefs: ext4
+     destination: fakedest

src/modules/unpackfs/tests/7.global

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+---
+rootMountPoint: /tmp/unpackfs-test-run-rootdir3/

src/modules/unpackfs/tests/7.job

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+---
+unpack:
+   - source: .
+     sourcefs: ext4
+     destination: realdest