Add feature-pack dependency to archetypes module to ensure correct build order

[jamesnetherton]

This is a result of the duff advice I gave on IRC (sorry Thomas!):

<tdiesler> jnetherton, is it true that archetypes have no deps on any other wfc module?
<jnetherton> tdiesler, yes correct

This is actually not the case. The archetype unit tests depend on the subsystem having been built and packaged beforehand.

Best to put this module back into it's previous place before the itest module.

[tdiesler]

A maven build cannot rely on the declared order of modules in the POM, it must instead use dependencies to define the build order. A build that does not use dependencies breaks --also-make

IOW, this should work:

mvn clean install -pl archetypes -am