This PR reduces the time it takes for Travis to complete the checks.
The following changes are made:
- Disabled LTO for test builds
- Merged Debugger tests into x86-64 Conformance tests
- Moved the INIT_FINI unittests into the regular unittests
- Merged SonarQube and Coverity Scan tasks
- Re-arranged some of the tasks
JerryScript-DCO-1.0-Signed-off-by: Dániel Bátyai dbatyai@inf.u-szeged.hu