Make heapwatch.py port configurable

[bricerisingalgorand]

Summary

This makes it possible to configure which port algod is running on when using heapWatch.py

Test Plan

I tested this by running it against betanet and checking which port is getting used when the new arg is/isn't added.

[codecov-commenter]

Codecov Report

Merging #3143 (70f850d) into master (729e597) will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #3143   +/-   ##
=======================================
  Coverage   43.78%   43.78%           
=======================================
  Files         391      391           
  Lines       86880    86880           
=======================================
+ Hits        38038    38042    +4     
+ Misses      42808    42806    -2     
+ Partials     6034     6032    -2     

Impacted Files	Coverage Δ
util/metrics/gauge.go	68.00% <0.00%> (-2.67%)	⬇️
util/metrics/counter.go	78.57% <0.00%> (-2.39%)	⬇️
network/requestTracker.go	70.25% <0.00%> (-0.87%)	⬇️
data/abi/abi_type.go	93.03% <0.00%> (ø)
ledger/acctupdates.go	64.75% <0.00%> (+0.09%)	⬆️
network/wsPeer.go	71.46% <0.00%> (+0.26%)	⬆️
ledger/blockqueue.go	82.18% <0.00%> (+1.14%)	⬆️
txnsync/mainloop.go	87.32% <0.00%> (+1.40%)	⬆️
ledger/roundlru.go	96.22% <0.00%> (+5.66%)	⬆️

---

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 729e597...70f850d. Read the comment docs.