Disabling tests from running in parallel

.travis.yml

@@ -11,7 +11,7 @@ addons:
     - libunwind8
     - zlib1g
 env:
-  - KOREBUILD_DNU_RESTORE_CORECLR=true KOREBUILD_TEST_DNXCORE=true
+  - KOREBUILD_DNU_RESTORE_CORECLR=true KOREBUILD_TEST_DNXCORE=true NO_PARALLEL_TEST_PROJECTS=E2ETests
 install:
   - curl -sSL https://github.com/libuv/libuv/archive/v1.4.2.tar.gz | tar zxfv - -C /tmp && cd /tmp/libuv-1.4.2/
   - sh autogen.sh