Firecracker v0.17.0

Added

• New API call: PATCH /machine-config/, used to update VM configuration,
  before the microVM boots.
• Added an experimental swagger definition that includes the specification for
  the vsock API call.
• Added a signal handler for SIGBUS and SIGSEGV that immediately terminates
  the process upon intercepting the signal.
• Added documentation for signal handling utilities.
• Added [alpha] aarch64 support.
• Added metrics for successful read and write operations of MMDS, Net and Block devices.

Changed

• vcpu_count, mem_size_mib and ht_enabled have been changed to be mandatory
  for PUT requests on /machine-config/.
• Disallow invalid seccomp levels by exiting with error.

Fixed

• Incorrect handling of bind mounts within the jailed rootfs.
• Corrected the guide for Alpine guest setup.