osd: osd_types: add pool quota related fields
common: util: add 'unit_to_bytesize()' function

Converts from a numerical value that may or may not contain an unit
modifier ('1024', '1K', '2M', ..., '1E') and returns the parsed size
in bytes.

Signed-off-by: Joao Eduardo Luis <joao.luis@inktank.com>
mon: Monitor: check if 'pss' arg is !NULL on parse_pos_long()

We already do it all throughout the function, but this one place didn't.

Signed-off-by: Joao Eduardo Luis <joao.luis@inktank.com>
ReplicatedPG: check for full if delta_stats.num_bytes > 0

Signed-off-by: Samuel Just <sam.just@inktank.com>
mon: OSDMonitor: add 'osd pool set-quota' command

Signed-off-by: Joao Eduardo Luis <joao.luis@inktank.com>