Add OSSessions

[dbwiddis]

Fixes #1221

[coveralls]

Coverage decreased (-0.2%) to 88.313% when pulling 80e22cc on dbwiddis:who into 36ca1a1 on oshi:master.

[codecov]

Codecov Report

Merging #1231 into master will decrease coverage by 0.58%.
The diff coverage is 70.58%.

@@             Coverage Diff              @@
##             master    #1231      +/-   ##
============================================
- Coverage     86.25%   85.66%   -0.59%     
- Complexity      267      279      +12     
============================================
  Files            24       25       +1     
  Lines           873      907      +34     
  Branches        121      124       +3     
============================================
+ Hits            753      777      +24     
- Misses           69       75       +6     
- Partials         51       55       +4     

Impacted Files	Coverage Δ	Complexity Δ
...rc/main/java/oshi/software/os/OperatingSystem.java	82.35% <ø> (ø)	0.00 <0.00> (ø)
oshi-core/src/main/java/oshi/util/ParseUtil.java	93.26% <56.25%> (-2.01%)	116.00 <4.00> (+4.00)	⬇️
...core/src/main/java/oshi/software/os/OSSession.java	83.33% <83.33%> (ø)	8.00 <8.00> (?)

---

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 36ca1a1...80e22cc. Read the comment docs.