Enrich arm64 tests in Travis matrix

1, Remove simple test just with --strict-warnings enabled.
2, Share the three common envs with amd64.
3, Add matrix item running test in bionic(default xenial) for arm64.
4, Enable MSan test on arm64 for extended test.
5, Enable UBSan test on arm64 for extended test.

Change-Id: Ic1f2c5e39ee6fbafed6ede74a925301121463520

Reviewed-by: Paul Dale <paul.dale@oracle.com>
Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/10519)

.travis.yml

@@ -16,6 +16,11 @@ before_install:
     - if expr "$CONFIG_OPTS" ":" ".*enable-external-tests" > /dev/null; then
           git submodule update --init --recursive;
       fi;
+    - eval "${MATRIX_EVAL}"
+
+arch:
+    - amd64
+    - arm64
 
 os:
     - linux
@@ -34,8 +39,25 @@ matrix:
     include:
         - os: linux
           arch: arm64
-          compiler: gcc
-          env: CONFIG_OPTS="--strict-warnings"
+          dist: bionic
+          compiler: clang
+          env: CONFIG_OPTS="--strict-warnings -D__NO_STRING_INLINES no-deprecated" BUILDONLY="yes"
+        - os: linux
+          arch: arm64
+          compiler: clang
+          addons:
+              apt:
+                  packages:
+                      - clang-6.0
+          env: EXTENDED_TEST="yes" CONFIG_OPTS="enable-msan disable-afalgeng -D__NO_STRING_INLINES -Wno-unused-command-line-argument" MATRIX_EVAL="CC=clang-6.0 && CXX=clang++-6.0"
+        - os: linux
+          arch: arm64
+          compiler: clang
+          addons:
+              apt:
+                  packages:
+                      - clang-6.0
+          env: EXTENDED_TEST="yes" CONFIG_OPTS="no-asm enable-ubsan enable-rc5 enable-md2 enable-ssl3 enable-ssl3-method enable-nextprotoneg no-shared enable-buildtest-c++ -fno-sanitize=alignment -DFUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION -D__NO_STRING_INLINES -Wno-unused-command-line-argument" MATRIX_EVAL="CC=clang-6.0 && CXX=clang++-6.0"
         - os: linux
           arch: s390x
           compiler: gcc
@@ -126,6 +148,8 @@ matrix:
           compiler: clang
         - os: osx
           compiler: gcc
+        - arch: arm64
+          os: osx
 
 before_script:
     - env