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Description of problem:
When using arguments --file or --fileas with value of nonexistent file (let's say "nonexistent"), the command does not do any checking and probably ignores the argument instead. The command succeeds.

# lsmcli -u "sim://" fs-create --pool POOL_ID_00001 --name test --size 1G
ID          | Name | Total Space | Free Space | Pool ID       | System ID
-------------------------------------------------------------------------
FS_ID_00001 | test | 1073741824  | 1073741824 | POOL_ID_00001 | sim-01
# lsmcli -u "sim://" fs-dependants --fs FS_ID_00001
False
# lsmcli -u "sim://" fs-dependants --fs FS_ID_00001 --file "nonexistent"
False
# echo $?
0

Note: lsmcli fs-snap-restore has the same bahaviour.

Version-Release number of selected component (if applicable):
libstoragemgmt-1.6.1-2.el7.x86_64

How reproducible:
100%

Steps to Reproduce:
1. lsmcli -u "sim://" fs-create --pool POOL_ID_00001 --name test --size 1G
2. lsmcli -u "sim://" fs-dependants --fs FS_ID_00001 --file "nonexistent"


Actual results:
False

Expected results:
lsmcli error: --file "nonexistent" does not exist

Additional info:

The simulator has limitations, this is one of them.  To support this feature we would need the ability to simulate the FS too and allow some type of interface outside lsmcli to create files etc. so that the sim plugin would have something to check against.