Fix the name of the `mem_total` inventory parameter in tests.
Fix the name of the `mem_total` inventory parameter in tests.

`mem_total` was changed to `mem_total_kB` in the example inventory
script.

Signed-off-by: Marcin Pasinski <473faad59dd39d8c25ce5634da61459ba6532c3c@cfengine.com>

pasinskim/integration,pasinskim/integration,GregorioDiStefano/integration,pasinskim/integration,GregorioDiStefano/integration