Fix k3s-killall.sh support for custom data dir

[brandond]

Proposed Changes

Fix k3s-killall.sh support for custom data dir that does not end with /k3s

Types of Changes

bugfix

Verification

See linked issue.

Testing

Linked Issues

• k3s-killall.sh does not work if data-dir doesn't end with /k3s #10708

User-Facing Change

Further Comments

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 42.97%. Comparing base (019b0af) to head (b57df3c).

❗ There is a different number of reports uploaded between BASE (019b0af) and HEAD (b57df3c). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (019b0af)	HEAD (b57df3c)
e2etests	7	6

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #10709      +/-   ##
==========================================
- Coverage   49.53%   42.97%   -6.57%     
==========================================
  Files         179      179              
  Lines       14979    14979              
==========================================
- Hits         7420     6437     -983     
- Misses       6207     7348    +1141     
+ Partials     1352     1194     -158     

Flag	Coverage Δ
e2etests	35.90% <ø> (-10.34%)	⬇️
inttests	19.67% <ø> (-16.99%)	⬇️
unittests	13.39% <ø> (ø)

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