Upgrading Bazel to 3.0.0 (#3510)

* Bazel 3.0.0
* Updated to use `rules_jvm_external`
* Buildozer cleanup

Author: nicknezis

.travis.yml

@@ -15,6 +15,8 @@ addons:
   apt:
     packages:
       - libtool-bin
+      - libcppunit-dev
+      - pkg-config
       - python-dev
       - python-wheel
       - wget
@@ -24,7 +26,7 @@ addons:
       - libgoogle-perftools-dev
 
 env:
-  - BAZEL_VERSION=0.26.0 ENABLE_HEAPCHECK=1
+  - BAZEL_VERSION=3.0.0 ENABLE_HEAPCHECK=1
 
 before_install:
   # download and install bazel
@@ -41,4 +43,4 @@ script:
   - python -V
   - which python2.7
   - python2.7 -V
-  - scripts/travis/ci.sh
+  - scripts/travis/ci.sh

README.md

@@ -32,7 +32,7 @@ Confluence: https://cwiki.apache.org/confluence/display/HERON
 #### Heron Requirements:
  * Java 11
  * Python 2.7
- * Bazel 0.26.0
+ * Bazel 3.0.0
 
 ## Contact