build:  Add new package dependencies

Add libboost-system-dev (bug #4725).

Add hdparm to rpm installation requirements.  The hdparm
command is used to determin if write-caching is enabled on
the journal device.

Signed-off-by: Gary Lowell  <gary.lowell@inktank.com>
Merge branch 'wip-4725'  Add build dependencies (Bug 4725)
debian/control:  Fix typo in libboost version number

Signed-off-by: Gary Lowell  <gary.lowell@inktank.com>
rgw_bucket: Fix dump_index_check.

Signed-off-by caleb miles <caleb.miles@inktank.com>
doc: Added users to Getting Started.

Signed-off-by: John Wilkins <john.wilkins@inktank.com>