Implement access trough stat

See merge request zdvresearch_bsc/adafs!138

Do not override CFLAGS while compiling dependencies

See merge request zdvresearch_bsc/adafs!137

CHECK_ACCESS didn't make any sense since internally we don't support uid/gid

DO_LOOKUP were not used at all

gid and uid metadata fields have never been used and can be removed
safely

The access RPC have been removed. The POSIX access functionality now is implemented through the stat RPC. This makes code easier to maintain and modify.

There would be a little performance degradation on the POSIX access
function because we are now retrieving also the metadata
associated to the file.

This change makes a lot easier to add symlink support

Project restracture

See merge request zdvresearch_bsc/adafs!135

change CMake project name `ifs` -> `GekkoFS`

the `ifs_test` folder have been renamed simply `test`

All the produced binary are now named `gkfs_*` instead of `ifs_*`

Fix various log messages

See merge request zdvresearch_bsc/adafs!133

CMake: don't use custom format for log messages

See merge request zdvresearch_bsc/adafs!131

Add MIT License

See merge request zdvresearch_bsc/adafs!132

Don't use custom format for the build type log entry.

update libfabric to v1.7.0

See merge request zdvresearch_bsc/adafs!126

use print function for python3 compatiblity

See merge request zdvresearch_bsc/adafs!129

* Use the print function to make the startup and shutdown script python3
  compatibility.

Cleanup unused configuration constant

See merge request zdvresearch_bsc/adafs!128

Add support for `AT_FDCWD` in some intercepted functions

Closes #88

See merge request zdvresearch_bsc/adafs!127

Some of the glibc intercepted functions,
that are accepting the directory file descriptor,
where still using legacy code to relativize the input path.

Disable interception during library shutdown

See merge request zdvresearch_bsc/adafs!114

If we intercept function during shutdown we could try to access the
internal file map that has been already freed.

This woun't affect performance at runtime since we are always checking
only one boolean flags on every interception as before.

On the other hand should sppedup the shutdown of the library, because we
disable the interception of glibc library call before performing the
shutdown routines.

Update mercury and drop margo handles patch

See merge request zdvresearch_bsc/adafs!125

Since mercury fixed the issue on their code [1], we can drop the
temporary patch we were using to avoid handles reset.

Due to the mercury fix The follwing two issues have been solved:
 - Mercury: https://github.com/mercury-hpc/mercury/issues/272
 - Margo: https://xgitlab.cels.anl.gov/sds/margo/issues/47

[1]: https://github.com/mercury-hpc/mercury/commit/9512b8b04c265645f95fd99f3b9c015e836c0347