so we shouldn't have to load all of them to run this utility. The
overall goal of this PR is to narrow down what modules
(exploit/aux + payload + encoder + nop) you possibly need in order
to shave off loading time. By doing this, on my box this is 5-6
seconds faster than the original one.
I actually tried to avoid making too many changes in the library
(such as Module Manager), because we don't have test cases for them,
and we can't really afford to risk breaking it. I also developed
a test script to actually be able to test msfcli.