fix parse boot_id error

This bug was caused by an upgrade of the parse library: parse 1.19.0
Released: Jan 14, 2021.
There is a "\n" at the end of contents of /proc/sys/kernel/random/boot_id.

Bug: b/177880369

Test: run vts -m VtsKernelProcFileApi -t
VtsKernelProcFileApi#testProcSysKernelRandomBootId

Change-Id: Id0c4c0b2dd136289bfcf11e6a840d1d52253644d
1 file changed