feat: Improve module installation checks by using integrated methods

[Hipska]

Base information

Question	Answer
Related to a SourceForge thread / Another PR / Combodo ticket?	N/A
Type of change?	Enhancement

Objective

Cleaner code in vSphereCollectionPlan::Init.

Proposed solution

Make use of Utils::CheckModuleInstallation.

Checklist before requesting a review

• I have performed a self-review of my code, and that it's compliant with Combodo's guidelines
• I have tested all changes I made on an iTop instance
• I have added a unit test, otherwise I have explained why I couldn't
• I have made sure the PR is clear and detailled enough so anyone can understand the real purpose without digging in the code

Checklist of things to do before PR is ready to merge

• Get itop-data-collector-base#58 merged

[Hipska]

I would also change the logic for detecting TeemIP, if discovery is enabled, then the module should be considered as required rather than optional.

[xtophe38]

Good idea. But let's wait, first, that the method Utils::GetModuleVersion becomes available in itop-data-collector-base. It is currently a proposal, part of PR #58