Fix: tests: don't match command line arguments, match static build binary names

Fix: tests: don't match command line arguments, match static build binary names

Don't match command line arguments for lttng-sessiond, lttng-relayd,
lttng-consumerd, lttng-runas, lt-lttng-sessiond, lt-lttng-relayd, only
match the executables.

Otherwise, if any unrelated command on the system match those as
arguments (e.g. text editor opening a text file), it hangs the tests.

Static build don't generate a lt-lttng-sessiond as binary name. Expect
lttng-session for this case.

Static build don't generate a lt-lttng-relayd as binary name.  Expect
lttng-relayd for this case.

Fixes: #977
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>