Add logs with more system specs

[fxamacker]

Mitigations for SPECTRE-V2, SPECTRE-BHB, etc. can affect performance, so log microcode revision, kernel version, etc. at startup.

Also log Go version because performance can differ between Go 1.16 and 1.17.

Changes include:

• Add CPU microcode revision
• Add OS, Platform, PlatformVersion, KernelVersion, Uptime
• Add Go version, GOMAXPROCS, NumCPU
• rename logHardware() to logSysInfo()
• rename "hardare specs" (logging) module to "system specs"

Closes #2178 #2183

[codecov-commenter]

Codecov Report

Merging #2187 (fb68a6a) into master (5af3bb2) will decrease coverage by 0.00%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2187      +/-   ##
==========================================
- Coverage   57.54%   57.54%   -0.01%     
==========================================
  Files         642      642              
  Lines       38117    38117              
==========================================
- Hits        21935    21933       -2     
- Misses      13392    13394       +2     
  Partials     2790     2790              

Flag	Coverage Δ
unittests	57.54% <ø> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
consensus/hotstuff/eventloop/event_loop.go	68.29% <0.00%> (-2.44%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 5af3bb2...fb68a6a. Read the comment docs.