Ensure default CouchDB installation can access the hmac ini file

[amaltaro]

This is a complement for #1088

As Imran reported, CouchDB deployment fails with:

++ perl -p -i -e 's|{ROOT}|/data/srv|g' /data/srv/beHG2207d/config/couchdb/local.ini
+++ tail -n1 /data/srv/beHG2207d/auth/couchdb/hmackey.ini
tail: cannot open ‘/data/srv/beHG2207d/auth/couchdb/hmackey.ini’ for reading: Permission denied
++++ err=1
++++ note 'ERROR: installation failed with exit code 1.'
++++ echo 'ERROR: installation failed with exit code 1.'
ERROR: installation failed with exit code 1.
++++ echo 'ERROR: installation failed with exit code 1.'
++++ exit 1