(maint) Correct path for hsqldb storage

For some reasons we switched this to use /usr/share/puppetdb/db, which has a
softlink to /var/lib/puppetdb/db. This is not aligned with the PuppetDB core
nor is it following FHS.

Signed-off-by: Ken Barber <ken@bob.sh>
Merge pull request #151 from kbarber/maint/master/fix-hsqldb-store-path

(maint) Correct path for hsqldb storage