[cuebot/cuegui/pycue/rqd] Store PSS and MaxPSS

[DiegoTavares]

Overview

Update modules to properly store PSS (Proportional Set Size) alongside RSS (Resident Set Size) for measuring process memory usage on Linux systems.

Key Differences:

• RSS: Total physical memory including full count of shared libraries (can be misleading)
• PSS: Proportional share - shared pages divided by number of processes sharing them (more accurate)
• Source: /proc/[pid]/smaps_rollup (Linux kernel 4.14+) provides pre-summed PSS values

Current State:

Rqd contains a config property to collect memory as either RSS or PSS. Information is saved on Cuebot and displayed as Rss.

Proposed Solution:

Rqd collects and reports both RSS and PSS. Cuebot stores both in the database. pycue and cuegui display both.

Tasks:

• Update rqd to collect PSS
• Update proto and cuebot to store data on the database
• Update pycue and cuegui to display PSS
• Fix accidentally refformated python files

[ramonfigueiredo]

LGTM with minor suggestions