[kube] Add CAP_SYS_RESOURCE to m3db container

[schallert]

What this PR does / why we need it: Updates Kubernetes manifests to ensure M3DB containers can raise their permissions.

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing and/or backwards incompatible change?:

Does this PR require updating code package or user-facing documentation?:

[codecov]

Codecov Report

Merging #2174 into master will decrease coverage by 6.9%.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           master   #2174     +/-   ##
========================================
- Coverage    72.3%   65.3%   -7.0%     
========================================
  Files        1016    1012      -4     
  Lines       87981   87240    -741     
========================================
- Hits        63627   57015   -6612     
- Misses      20092   26396   +6304     
+ Partials     4262    3829    -433     

Flag	Coverage Δ
#aggregator	82.0% <ø> (ø)	⬆️
#cluster	74.1% <ø> (-11.3%)	⬇️
#collector	82.8% <ø> (ø)	⬆️
#dbnode	78.2% <ø> (-1.2%)	⬇️
#m3em	68.8% <ø> (-5.7%)	⬇️
#m3ninx	71.1% <ø> (-3.1%)	⬇️
#m3nsch	28.4% <ø> (-22.8%)	⬇️
#metrics	17.6% <ø> (ø)	⬆️
#msg	74.8% <ø> (+1.8%)	⬆️
#query	40.9% <ø> (-27.4%)	⬇️
#x	82.6% <ø> (ø)	⬆️

---

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[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@279af5e). Click here to learn what that means.
The diff coverage is 100%.

@@           Coverage Diff            @@
##             master   #2174   +/-   ##
========================================
  Coverage          ?   70.7%           
========================================
  Files             ?    1016           
  Lines             ?   88002           
  Branches          ?       0           
========================================
  Hits              ?   62285           
  Misses            ?   21476           
  Partials          ?    4241

Flag	Coverage Δ
#aggregator	82% <ø> (?)
#cluster	67.4% <ø> (?)
#collector	82.8% <ø> (?)
#dbnode	79.2% <100%> (?)
#m3em	74.4% <ø> (?)
#m3ninx	65.5% <ø> (?)
#m3nsch	51.1% <ø> (?)
#metrics	17.6% <ø> (?)
#msg	74.8% <ø> (?)
#query	68.3% <ø> (?)
#x	82.7% <ø> (?)

---

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[robskillington]

LGTM