FORMUS3IC_LAS3 / embb

mtapi_network_c: allowed for specifying maximum connection count on listen, select for multiple sockets and partial buffer receive

The bash script before used to determine the path of itself (this is the path with the test binaries). In the /bin/sh script the current path was used instead and the tests failed. Replaced with /bin/sh compatible code, to get the script directory.

- Rename run_tests_linux.sh to run_tests_unix.sh
- Use /bin/sh instead of bash