cli: give filter option only when output 'tabularized' is enabled

Signed-off-by: Rohit Yadav <bhaisaab@apache.org>
cli: fix cloudmonkey's pipe-ability

Signed-off-by: Rohit Yadav <bhaisaab@apache.org>
Conditionally show select SG step

Only show select security group step if at least one guest network
with SecurityGroup service is selected.