Skip test file generation

[wing328]

PR checklist

• Read the contribution guidelines.
• Ran the shell script under ./bin/ to update Petstore sample so that CIs can verify the change. (For instance, only need to run ./bin/{LANG}-petstore.sh and ./bin/security/{LANG}-petstore.sh if updating the {LANG} (e.g. php, ruby, python, etc) code generator or {LANG} client's mustache templates). Windows batch files can be found in .\bin\windows\.
• Filed the PR against the correct branch: master, 3.4.x, 4.0.x. Default: master.
• Copied the technical committee to review the pull request if your PR is targeting a particular programming language.

Description of the PR

• Skip test file generation as it's not yet implemented.
• Update CMakefile locally (whitelist in .openapi-generator-ignore) to compile the manually-written test files.

[wing328]

The C Petstore tests passed. The failure (timeout) is due to other tests taking too long to run.

successful operation
Data is:{
	"id":	1234,
	"category":	{
		"id":	5,
		"name":	"Example Category"
	},
	"name":	"Rocky Handsome",
	"photoUrls":	["http://www.github.com", "http://www.gitter.im"],
	"tags":	[{
			"id":	1,
			"name":	"beautiful code"
		}, {
			"id":	542353,
			"name":	"at least I tried"
		}],
	"status":	"sold"
}
successful operation
User is: 
{
	"id":	1234,
	"username":	"example123",
	"firstName":	"Example1",
	"lastName":	"Example2Last",
	"email":	"example@example.com",
	"password":	"thisisexample!123",
	"phone":	"+123456789",
	"userStatus":	4
}
successful operation
Login User: logged in user session:1542332069810
successful operation
Placed order: 
{
	"id":	1234,
	"petId":	12345,
	"quantity":	50,
	"shipDate":	"2018-09-24T10:19:09.592+0000",
	"status":	"placed",
	"complete":	true
}
successful operation
Order received: 
{
	"id":	1234,
	"petId":	12345,
	"quantity":	50,
	"shipDate":	"2018-09-24T10:19:09.592+0000",
	"status":	"placed",
	"complete":	true
}
Order Deleted 
Order not found
Order Not present 
successful operation
sold - 2
pending - 2
available - 7