#2462: Upgrade to jboss-parent 26 to prepare for Java 11
#2462: Upgrade to jboss-parent 26 to prepare for Java 11

(cherry picked from commit 229e783bc2d5a0e8de807e03b4e4dda5ce3db213)

hawtio/hawtio,skarsaune/hawtio,skarsaune/hawtio,skarsaune/hawtio,tadayosi/hawtio,tadayosi/hawtio,hawtio/hawtio,tadayosi/hawtio,tadayosi/hawtio,hawtio/hawtio,skarsaune/hawtio,tadayosi/hawtio,hawtio/hawtio,hawtio/hawtio,skarsaune/hawtio