Fix Coveralls and Sonar configuration

[mliszcz]

Coveralls and Sonar integration was disabled in 226d70c and then re-enabled in 890fd59. Seems that it no longer works correctly. Original report: #607 (comment)

https://travis-ci.org/tango-controls/cppTango/jobs/640430653?utm_medium=notification&utm_source=github_status

Coveralls:

[  0%] Built target coveralls_generate
make -f CMakeFiles/coveralls_upload.dir/build.make CMakeFiles/coveralls_upload.dir/depend
make[3]: Entering directory '/home/tango/src/build'
cd /home/tango/src/build && /usr/bin/cmake -E cmake_depends "Unix Makefiles" /home/tango/src /home/tango/src /home/tango/src/build /home/tango/src/build /home/tango/src/build/CMakeFiles/coveralls_upload.dir/DependInfo.cmake --color=
Scanning dependencies of target coveralls_upload
make[3]: Leaving directory '/home/tango/src/build'
make -f CMakeFiles/coveralls_upload.dir/build.make CMakeFiles/coveralls_upload.dir/build
make[3]: Entering directory '/home/tango/src/build'
/usr/bin/cmake -E cmake_progress_report /home/tango/src/build/CMakeFiles 34
[100%] Uploading coveralls output...
/usr/bin/curl -S -F json_file=@/home/tango/src/build/coveralls.json https://coveralls.io/api/v1/jobs
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed

  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
 15 1031k    0     0   15  160k      0  1260k --:--:-- --:--:-- --:--:-- 1261k
100 1031k    0    72  100 1031k     54   774k  0:00:01  0:00:01 --:--:--  773k
100 1031k    0    72  100 1031k     54   774k  0:00:01  0:00:01 --:--:--  773k
{"message":"Couldn't find a repository matching this job.","error":true}make[3]: Leaving directory '/home/tango/src/build'

Coverage is not visible: https://coveralls.io/github/tango-controls/cppTango

Sonar:

�[0K$ test ${SONAR_SCANNER} = "ON" && .travis/sonar.sh
Using SONAR_PROPERTIES=-Dsonar.pullrequest.base=tango-9-lts -Dsonar.pullrequest.branch=reset-database-and-ds-for-each-test -Dsonar.pullrequest.key=640
.travis/sonar.sh: line 11: sonar-scanner: command not found