Merge branch 'allow-usage-as-submodule' into 'master'

Allow usage as submodule

See merge request !386
19 jobs for master in 32 minutes and 46 seconds (queued for 4 seconds)
Status Name Job ID Coverage
  Compilation
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passed cmp:cc7-gcc #11176071
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passed cmp:slc6-gcc #11176068
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  Testing
passed tst:align #11176087
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  Formatting
passed fmt:cc7-llvm-lint #11176103
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passed fmt:centos7-llvm-format #11176096
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passed fmt:codespell #11176111
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  Documentation
passed cmp:doxygen #11176114
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  Packaging
passed pkg:cc7-gcc #11176126
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passed pkg:slc6-gcc #11176120
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  Deployment
passed deploy-cvmfs #11176130
cvmfs-deploy

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docker-image-build

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