Update doc for sample config file issue

Since we have removed the ceilometer.conf.sample file, we should
update the documentation too.

Change-Id: I93ff8bf2f3332d15495d45a5e55e6252da639302
Closes-Bug: #1320761
Change using of limit argument in get_sample

Use 'limit' as argument in scan method instead of self written approach.

Change-Id: I2576b3bf3bb210ba0f21391766e62e19c23b21a0
Fix the meter type for LB Bytes

This fixes the type on bytes in/out to cumulative.
Eventually when connections are fixed in LBaaS side,
those would be cumulative too. Also update the
measurement docs to reflect the newest changes.

Closes-Bug: 1328573

Change-Id: Iab221829702ab36a844d0ae65c6a3312a311a92b
Merge "Change using of limit argument in get_sample"
Merge "Update doc for sample config file issue"
Merge "Fix the meter type for LB Bytes"