main: refactoring main function for vmm_no_api
main: refactoring main function for vmm_no_api

Added a separate function to handle the vmm_no_api case.

Signed-off-by: Andreea Florescu <f68a7d732e796861f8e79ea704b43a5ee52eddaf@amazon.com>

firecracker-microvm/firecracker,firecracker-microvm/firecracker,firecracker-microvm/firecracker,firecracker-microvm/firecracker,firecracker-microvm/firecracker