bugfix: Fixes timer replacement without clearing the old one present

[rkilingr]

Fixes issue #??
#140

Proposed Changes

• Add a Timer Stop before replacing the old timer with the rescheduled one.

Testing Done

• No increase seen even after days
  

• Unit tests

fetching envtest tools@1.19.2 (into '/Users/rkilingar/projects/active-monitor/testbin')
tar: Failed to set default locale
x bin/
x bin/etcd
x bin/kubectl
x bin/kube-apiserver
setting up env vars
ok      github.com/keikoproj/active-monitor/api/v1alpha1        17.629s coverage: 0.8% of statements
ok      github.com/keikoproj/active-monitor/controllers 42.703s coverage: 66.5% of statements
ok      github.com/keikoproj/active-monitor/metrics     2.106s  coverage: 81.8% of statements
?       github.com/keikoproj/active-monitor/store       [no test files]

[codecov]

Codecov Report

Merging #141 (710b941) into master (2c2375e) will increase coverage by 1.51%.
The diff coverage is 0.00%.

❗ Current head 710b941 differs from pull request most recent head 505d48b. Consider uploading reports for the commit 505d48b to get more accurate results

@@            Coverage Diff             @@
##           master     #141      +/-   ##
==========================================
+ Coverage   61.42%   62.93%   +1.51%     
==========================================
  Files           3        3              
  Lines         910      912       +2     
==========================================
+ Hits          559      574      +15     
+ Misses        263      250      -13     
  Partials       88       88              

Impacted Files	Coverage Δ
controllers/healthcheck_controller.go	62.66% <0.00%> (+1.55%)	⬆️

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[rkilingr]

Updated unit tests to include the diff