Create a guide for HttpSession caching with Infinispan

[gkwan-ibm]

Requested by OpenLiberty/guide-sessions#145

OL supports HttpSession caching with Infinispan

• https://openliberty.io/blog/2020/01/08/infinispan-open-liberty-openshift.html

[gkwan-ibm]

@corporate-gadfly

[gkwan-ibm]

studied the sessions and infinispan with

• embedded mode
  • OL LMP dev mode works
  • but not work in kubernetes (without mpMetrics and mpReactiveStreams features)
  • requires mpReactiveStreams feature that OL does not support it with EE9 yet
  • code at https://github.com/gkwan-ibm/draft-guide-sessions-infinispan/tree/draft-embedded/finish
• client/server mode
  • work in kubernetes
  • OL LMP devc mode works occasionally (i.e. not reliable)
  • code at https://github.com/gkwan-ibm/draft-guide-sessions-infinispan/tree/draft/finish