Merge branch 'dep_scripts_update' into 'master'

Minor dependency script updates:

* adding more optional versions to the dependency scripts: RocksDB and syscall_intercept with glibc3 fix as more systems are updated to >glibc3
* Cloning libfabric instead of downloading the tarball. This is because it is configured with a specific autotools version which is not available on all systems. Cloning allows generating `configure` dynamically.
* daemon metadata backend now links to Dynamic Loader which is required by newer systems (not sure when this happened) and newer rocksdb versions
* removing python startup scripts since they are no longer supported and are confusing if part of the git repo

See merge request !57