Cleanup: use `modprobe --remove` rather than `rmmod`

Cleanup: use `modprobe --remove` rather than `rmmod`

Background
==========
According to the rmmod(8) man page:
  rmmod is a trivial program to remove a module (when module unloading
  support is provided) from the kernel. Most users will want to use
  modprobe(8) with the -r option instead.

`rmmod` simply unloads the provided module and decrements the refcount
of the modules it depended on but doesn't unload those dependencies if
their refcount is zero.

Issue
=====
With the following scenario we can end up if modules with a zero
refcount still loaded in the kernel:
  modprobe lttng-test
  lttng-sessiond
  ... (test case) ...
  ctrl+c sessiond
  rmmod lttng-test

When we teardown the lttng-sessiond, some modules are kept in the kernel
because the `lttng-test` module depends on them. So unloading
`lttng-test` using `rmmod` keeps those dependencies in the kernel.

Solution
========
Use `modprobe --remove` to unload modules and their now unused
dependencies.

From the modprobe(8) man page:
  -r, --remove
     This option causes modprobe to remove rather than insert a module.
     If the modules it depends on are also unused, modprobe will try to
     remove them too. Unlike insertion, more than one module can be
     specified on the command line

Note
====
This commit also replaces existing uses of `modprobe -r` to `modprobe
--remove` for consistency.

Signed-off-by: Francis Deslauriers <francis.deslauriers@efficios.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: I7be83a645097e1eddd478cfbb717906b971f04ea