Add support to declare link libraries needed for containers for bundles

[rlenferink]

Some bundles required that the container (executable) is linked against certain libraries (e.g. libjanson, libcurl, etc). To make this process more transparent add a CMake command to declare this and update the add_celix_container functionality to take this into account.

Somethink link celix_bundle_add_container_libraries

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Original creation date: 09/Apr/2018
Reporter: @pnoltes

[PengZheng]

Now bundles does not have such requirements any longer:

• In the build tree, BUILD_RPATH takes care of these bundle's dependencies.
• For the installed artifacts, it's assumed that all these dependencies is installed into proper location, LD_LIBRARY_PATH is set properly, and all these bundles have been linked against their dependencies correctly.