Move (almost all) Travis CI jobs to container-based infrastructure (#2333)

Container-based VMs promise significantly faster boot times.

More or less related changes:
- Added a JOBNAME to all jobs.
- Added `install-noapt` target to several Makefile.travis files to
  avoid `sudo apt-get install ...` steps. Those installations are
  now handled by the apt addon of Travis. The `install` targets are
  kept anyway to keep the makefiles self-contained.
- Removed a legacy workaround from the Coverity Scan job as it
  isn't necessary anymore to fiddle with the cerificates of
  scan.coverity.com.
- Fixed the Mbed and the Zephyr jobs.

JerryScript-DCO-1.0-Signed-off-by: Akos Kiss akiss@inf.u-szeged.hu

targets/mbed/Makefile.mbed

@@ -74,6 +74,7 @@ js2c:
 
 yotta:
 	cd targets/mbed; \
+	 export WCMAKE=`which cmake`; export PATH=`pwd`:$$PATH; \
 	 yotta target $(YOTTA_TARGET); \
 	 yotta build
 

targets/mbed/Makefile.travis

@@ -27,12 +27,12 @@ install-apt-get-deps:
 
 # Install yotta
 install-yotta:
-	pyenv global 2.7.13 # force the python version to a newer one
 	pip install --user "pyOpenSSL<17.5" # fix for failures with pyOpenSSL 17.5
 	pip install --user yotta
 
 # Perform all the necessary (JerryScript-independent) installation steps.
-install: install-apt-get-deps install-yotta
+install-noapt: install-yotta
+install: install-apt-get-deps install-noapt
 
 
 ## Targets for building Mbed with JerryScript.

targets/mbed/cmake

@@ -0,0 +1,22 @@
+#!/bin/bash
+
+# Copyright JS Foundation and other contributors, http://js.foundation
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# HACK:
+#       Wrapping cmake to ensure that yotta-driven cmake (3.6+) accepts
+#       arm-none-eabi-gcc as working compiler.
+#       WCMAKE variable must be set to the full path of the wrapped cmake.
+#       Related yotta issue: https://github.com/ARMmbed/yotta/issues/783
+$WCMAKE -DCMAKE_C_COMPILER_WORKS=TRUE $@