PHPApi in php_generator.py does not strip out spaces from api class name

[spuniani]

api.py toClassName method strips out spaces.

apis-client-generator/src/googleapis/codegen/api.py

Line 507 in dcad06f

return utilities.CamelCase(s).replace(' ', '')

however, this method is overridden in PHPApi, and the override does not strip out spaces. So if the owner name in the API annotations has spaces in it, the generator php classes are no longer valid.

apis-client-generator/src/googleapis/codegen/php_generator.py

Line 306 in dcad06f

return utilities.CamelCase(s)

On the same note, php classes also can't have "." in them, so these also need to be substituted out (possibly underscore "_"?)