Encode healthcheck message as UTF-8
Encode healthcheck message as UTF-8

The print function in the healthcheck.py script was trying to use UTF-8
text as ASCII text. Explicitly encoding it should fix this problem.

CiscoCloud/mantl,CiscoCloud/microservices-infrastructure,sehqlr/mantl,phnmnl/mantl,bitium/mantl,bitium/mantl,mantl/mantl,mantl/mantl,phnmnl/mantl,datascienceinc/mantl,datascienceinc/mantl,sehqlr/mantl,KaGeN101/mantl,CiscoCloud/microservices-infrastructure,CiscoCloud/mantl,KaGeN101/mantl