Release v0.7.2

What's Changed

• get latest host camera service by @shivasku82 in 97333a5
• support celadon ISO image flashing in start_flash_usb.sh script by @GangSecurity in 586a3f0
• Install fixed version for S/stable by @YadongQi in a1c6ff4
• Modified qemu download to be in QEMU_CACHE_DIR so that it can be reused by @iViggyPrabhu
  in 772c6a4
• Fix disk full error during flashing by @blackdobb in 46c0a28
• Bump version to 0.7.2 by @YadongQi in 99cb652

Full Changelog: v0.7.1...v0.7.2