bop zookeeper: add Kontena health_check. Also fix the Solr health check URI.
bop zookeeper: add Kontena health_check. Also fix the Solr health check URI.

cga-harvard/hhypermap-bop,cga-harvard/hhypermap-bop,cga-harvard/hhypermap-bop,cga-harvard/hhypermap-bop,dsmiley/hhypermap-bop,cga-harvard/hhypermap-bop,dsmiley/hhypermap-bop,cga-harvard/hhypermap-bop,dsmiley/hhypermap-bop,cga-harvard/hhypermap-bop