libxslt1-dev is used at least for asn1 and usrp. It breaks the build when in
check_install_additional_tools().
Move it to to check_install_oai_software()

uhd is not part of ubuntu standard repositories >= 14.04.
Move the removal of uhd in its own space and do not fail if it doesn't exists.

Merge branch 'feature-34-test_framework' of https://gitlab.eurecom.fr/oai/openairinterface5g into feature-34-test_framework

The distinction common space/user space still requires some
careful examination.

clang have changed its default standard to C11 compilation and is stricter.
Ensure use of gnu89 standard to use pthread extension for --castxml-gccxml

It can't link because nas_config.c and rb_config.c was commented.

Th struct SamplesPacket is a type declaration. It is not defined
in memory and thus samplesCount can't be declared static.
Transform it to true cpp static variable class as this is c++ source.

bladerf ppa don't publish packages for Ubuntu 16.04.
There are official packages for bladerf so we use these.

It breaks apt-get remove command

Add --disable-hardware-dependency flag to avoid hardware need when compiling OAI.
For the momment it avoids to flash bladeRF hardware

libpgm-dev will add the dependency on libpgm 5.2.0 or 5.1.0 automatically
according to the ubuntu version

liblas3gf have been replaced by libblas3 on 16.04
liblas3* will be pulled by libblas-dev, so we don't need to add it to package list

This package is needed for the command add-apt-repository

Thank to Thomas Laurent for refactorize get_distribution_released

build_helper exits early on error. compilations() tells where the
compilation logs can be found after compiling it. So in case of error, it
was never displayed.
Add a log info before compiling

There are a lot of case where the build scripts fails. Despite this, the
build script happily continue to the end and tells "Successfully built
xxxx".
This fix ensure the build stops early with the first error message on the
bottom of the log.