Allow parallel tests

The build matrix was updated to support running tests on multiple machines.

Other small changes to formatting and style where applied, plus clone git
repos without history.

.travis.yml

@@ -28,54 +28,102 @@ _addons: &addon_conf
 go:
   - "1.10"
 
+git:
+  depth: false
+
 matrix:
   include:
+    # newt build <targets>
     - os: linux
       addons: *addon_conf
-      env: 
+      env:
         - TEST=BUILD_TARGETS
+        - VM_AMOUNT=4
+        - TARGET_SET=1
     - os: linux
       addons: *addon_conf
-      env: 
-        - TEST=TEST_ALL
-    - os: linux
-      addons: *addon_conf
-      env: 
-        - TEST=BUILD_PORTS
-    - os: osx
-      osx_image: xcode9.2
-      env: 
+      env:
         - TEST=BUILD_TARGETS
-    - os: osx
-      osx_image: xcode9.2
-      env: 
+        - VM_AMOUNT=4
+        - TARGET_SET=2
+    - os: linux
+      addons: *addon_conf
+      env:
+        - TEST=BUILD_TARGETS
+        - VM_AMOUNT=4
+        - TARGET_SET=3
+    - os: linux
+      addons: *addon_conf
+      env:
+        - TEST=BUILD_TARGETS
+        - VM_AMOUNT=4
+        - TARGET_SET=4
+
+    # newt test all (Linux)
+    - os: linux
+      addons: *addon_conf
+      env:
         - TEST=TEST_ALL
+        - VM_AMOUNT=2
+        - TARGET_SET=1
+    - os: linux
+      addons: *addon_conf
+      env:
+        - TEST=TEST_ALL
+        - VM_AMOUNT=2
+        - TARGET_SET=2
+
+    # ports
+    - os: linux
+      addons: *addon_conf
+      env:
+        - TEST=BUILD_PORTS
+        - VM_AMOUNT=1
+        - TARGET_SET=1
+
+    # newt test all
     - os: osx
       osx_image: xcode9.2
-      env: 
-        - TEST=BUILD_PORTS
+      env:
+        - TEST=TEST_ALL
+        - VM_AMOUNT=3
+        - TARGET_SET=1
+    - os: osx
+      osx_image: xcode9.2
+      env:
+        - TEST=TEST_ALL
+        - VM_AMOUNT=3
+        - TARGET_SET=2
+    - os: osx
+      osx_image: xcode9.2
+      env:
+        - TEST=TEST_ALL
+        - VM_AMOUNT=3
+        - TARGET_SET=3
+
+before_install:
+  - printenv
+  - export GOPATH=$HOME/gopath
+  - go version
 
 install:
-- printenv
-- export GOPATH=$HOME/gopath
-- go version
+  - git clone https://github.com/runtimeco/mynewt-travis-ci $HOME/ci
+  - chmod +x $HOME/ci/*.sh
+  - $HOME/ci/${TRAVIS_OS_NAME}_travis_install.sh
 
-- git clone https://github.com/runtimeco/mynewt-travis-ci $HOME/ci
-- chmod +x $HOME/ci/*.sh
-- $HOME/ci/${TRAVIS_OS_NAME}_travis_install.sh
-
-- newt version
-- gcc --version
-- if [ "${TEST}" != "TEST_ALL" ]; then arm-none-eabi-gcc --version; fi
+before_script:
+  - newt version
+  - gcc --version
+  - if [ "${TEST}" != "TEST_ALL" ]; then arm-none-eabi-gcc --version; fi
+  - cp -R $HOME/ci/mynewt-nimble-project.yml project.yml
+  - cp -R $HOME/ci/mynewt-nimble-targets targets
+  - $HOME/ci/prepare_test.sh $VM_AMOUNT
+  - mkdir -p repos && pushd repos/
+  - git clone https://github.com/apache/mynewt-core apache-mynewt-core
+  - popd
 
 script:
-- cp -R $HOME/ci/mynewt-nimble-project.yml project.yml
-- cp -R $HOME/ci/mynewt-nimble-targets targets
-- mkdir -p repos && cd repos/
-- git clone https://github.com/apache/mynewt-core apache-mynewt-core
-- cd ..
-
-- $HOME/ci/run_test.sh
+  - $HOME/ci/run_test.sh
 
 cache:
   directories: