Update Travis CI files to account for new build dependencies

* Add Fedora 28 and Ubuntu 18.04 Dockerfile
* Add new build dependencies (for the ACRN tools)
* Change default Fedora version to 28

Signed-off-by: Geoffroy Van Cutsem <geoffroy.vancutsem@intel.com>

.travis.yml

@@ -0,0 +1,38 @@
+sudo: required
+
+language: c
+
+env:
+   global:
+      - OS_TESTED_CL="clearlinux"
+      - OS_TESTED_UBUNTU="ubuntu16.04"
+      - OS_TESTED_FEDORA="fedora28"
+
+   matrix:
+      - RELEASE=0
+        PLATFORM=sbl
+
+      - RELEASE=1
+        PLATFORM=sbl
+
+      - RELEASE=0
+        PLATFORM=uefi
+
+      - RELEASE=1
+        PLATFORM=uefi
+
+services:
+   - docker
+
+before_install:
+   - docker build -t ${OS_TESTED_CL} -f .travis-dockerfiles/Dockerfile.${OS_TESTED_CL} .
+   - docker build -t ${OS_TESTED_UBUNTU} -f .travis-dockerfiles/Dockerfile.${OS_TESTED_UBUNTU} .
+   - docker build -t ${OS_TESTED_FEDORA} -f .travis-dockerfiles/Dockerfile.${OS_TESTED_FEDORA} .
+   - docker images
+
+install: true
+
+script:
+   - docker run -v $PWD:/root/acrn ${OS_TESTED_CL} /bin/bash -c "make clean && make PLATFORM=$PLATFORM RELEASE=$RELEASE"
+   - docker run -v $PWD:/root/acrn ${OS_TESTED_UBUNTU} /bin/bash -c "make clean && make PLATFORM=$PLATFORM RELEASE=$RELEASE"
+   - docker run -v $PWD:/root/acrn ${OS_TESTED_FEDORA} /bin/bash -c "make clean && make PLATFORM=$PLATFORM RELEASE=$RELEASE"