jca 2.4.6 complied wt jdk11, jdk8 CI disabled until java8 version of jca

can be explicitly listed

Author: shroffk

.travis.yml

@@ -3,9 +3,6 @@ language: java
 
 matrix:
   include:
-    - jdk: openjdk8
-      before_install:
-        - export MVN_OPT='--projects "!gpclient/gpclient-javafx"'
     - jdk: openjdk11
 env:
   - EPICS_PVA_ADDR_LIST=127.255.255.255