commands/insmod: add new testcase to test insmod(8)

Add tst_module_exists() into the test.sh library.

Test the basic functionality of insmod(8) command.

Signed-off-by: Guangwen Feng <fenggw-fnst@cn.fujitsu.com>
Signed-off-by: Cyril Hrubis <chrubis@suse.cz>
5 files changed