Prepare 0.3.8
change default location of lock file to /run/fw_printenv.lock
do not create lock file with access for others
extended_config: Reject YAML configs with more than two devices
uboot_env: Handle snprintf() truncation case in .flags serialization
uboot_env: Reject too small configured environment sizes
uboot_env: Fix environment read bounds check on missing NUL terminator
uboot_env: Add comment for missing MAC / IP validation
uboot_env: Fix libuboot_validate_flags() boolean type validation
uboot_env: Reject empty strings in validate_int()
uboot_env: Handle environment cannot be locked
uboot_env: Add default FreeBSD lock file path
uboot_env: Fix Wswitch compiler warnings
extended_config: Remove unused STATE_NKEY
extended_config: Fix switch-case STATE_STOP indendation
Add ENODATA #define on FreeBSD
libubootenv: fix UBI sysfs parsing