rados.cc: fix listomapvals usage: key,val are not needed

Fixes: #3812
Signed-off-by: Samuel Just <sam.just@inktank.com>
Reviewed-by: David Zafman <david.zafman@inktank.com>
(cherry picked from commit 44c45e520cc2e60c6c803bb245edb9330bff37e4)
rados.cc: use omap_get_vals_by_keys in getomapval

Fixes: #3811
Signed-off-by: Samuel Just <sam.just@inktank.com>
Reviewed-by: David Zafman <david.zafman@inktank.com>
(cherry picked from commit cb5e2be418924cf8b2c6a6d265a7a0327f08d00a)
librados.hpp: fix omap_get_vals and omap_get_keys comments

We list keys greater than start_after.

Signed-off-by: Samuel Just <sam.just@inktank.com>
Reviewed-by: David Zafman <david.zafman@inktank.com>
(cherry picked from commit 3f0ad497b3c4a5e9bef61ecbae5558ae72d4ce8b)
rados.cc: fix rmomapkey usage: val not needed

Signed-off-by: David Zafman <david.zafman@inktank.com>
Reviewed-by: Samuel Just <samuel.just@inktank.com>
(cherry picked from commit 625c3cb9b536a0cff7249b8181b7a4f09b1b4f4f)
osdmaptool: allow user to specify pool for test-map-object

Fixes: #3820
Backport: bobtail
Signed-off-by: Samuel Just <sam.just@inktank.com>
Reviewed-by: Gregory Farnum <greg@inktank.com>
(cherry picked from commit 85eb8e382a26dfc53df36ae1a473185608b282aa)
osdmaptool: fix cli test

Signed-off-by: Sage Weil <sage@inktank.com>
(cherry picked from commit 5bd8765c918174aea606069124e43c480c809943)
osdmaptool: more fix cli test

Signed-off-by: Sage Weil <sage@inktank.com>
(cherry picked from commit b0162fab3d927544885f2b9609b9ab3dc4aaff74)