feat: Add option to run smoke tests with fake IMDS servers.

[jirihnidek]

• This change allow to run smoke tests of cloud provider with custom facts. Examples of custom facts are described in comments for each cloud provider

[github-actions]

Coverage (computed on Fedora latest) •

File	Stmts	Miss	Cover	Missing
cloud_what/providers
aws.py	185	48	74%	88, 103, 111, 148–149, 151–154, 156, 165, 168–169, 199, 203–204, 213–214, 253, 265, 324, 385–387, 389–390, 392–396, 398–399, 408–412, 414–418, 420–423, 429
azure.py	140	44	68%	108, 134, 138, 151–152, 179, 235–237, 261–262, 264, 266–267, 269–273, 275–276, 283–287, 289–295, 298–299, 302, 305–311, 317
gcp.py	150	34	77%	131, 146, 150, 225–226, 241, 247, 254, 262, 272, 351–352, 354, 356–357, 359–363, 365–366, 370–375, 377–378, 380–382, 388
TOTAL	18227	4619	74%

Tests	Skipped	Failures	Errors	Time
2640	14 💤	0 ❌	0 🔥	40.776s ⏱️

[m-horky]

LGTM