MFC	r271879:
awk: Use random(3) instead of rand(3)

While none of them is considered even near to cryptographic
level, random(3) is a better random generator than rand(3).

Use random(3) for awk as is done in other systems.

PR:		193147
MFC r272762: Correct scale factor for T terabyte suffix

PR:		194250
Merge remote-tracking branch 'freebsd/stable/10' into hardened/10/aslr