Resolve "GekkoFS v0.9.3 dependency bump"

Links to #274 

Closes #255

Closes #255

See merge request !165

GekkoFS user library creation.

Build over `replication/gekkofwd` changes. This MR aims to create a standalone library to use inside a client application without `LD_PRELOAD` and `syscall interception`.

The user library needs some changes as some `syscall_no_intercept` calls are scattered through the logging and the general code of the client.
Also we need to do not link `syscall_intercept` and to remove (or avoid) the `gekkofs` client constructor. 

There is an example of `write` - `read` on the example directory.

The user needs to link gkfs_user_lib.so and use user_functions.hpp (installed on include/gkfs directory)

See merge request !171

Update to fmt10

In order to reduce warnings, I propose an update to fmt10.

It builds over the other MR

* fmt10 needs a small change in Hermes (branch fmt10)
* fmt10 needs changes in date library 
* It produces segfaults as we get stuck in a syscall loop
* Removed date library and replaced with a small gmtime replacement without timezone
* Rocksdb updated
* 
* 0.9.3 docker images created

See merge request !172