DISPATCH-2011 Add aarch64 .travis.yml job; add HWASAN option

[jiridanek]

No description provided.

[codecov-io]

Codecov Report

Merging #1077 (12e4eb2) into master (b835eb7) will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1077      +/-   ##
==========================================
+ Coverage   82.26%   82.27%   +0.01%     
==========================================
  Files         111      111              
  Lines       27521    27521              
==========================================
+ Hits        22641    22644       +3     
+ Misses       4880     4877       -3     

Impacted Files	Coverage Δ
src/router_core/connections.c	88.62% <0.00%> (-0.20%)	⬇️
src/adaptors/http1/http1_server.c	84.79% <0.00%> (+0.29%)	⬆️
...re/modules/edge_addr_tracking/edge_addr_tracking.c	90.32% <0.00%> (+1.61%)	⬆️

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[jiridanek]

I noticed that Aarch64 tended to get scheduled on Travis a bit sooner than the amd64 builds! Also, I noticed that Travis has the s390x arch available, https://blog.travis-ci.com/2019-11-12-multi-cpu-architecture-ibm-power-ibm-z. That could be a good thing to take advantage of.