Review 28424

C. Thomas Tyler
verify_sdp.sh v5.21.0:

Added check that simply named files p4, p4d, p4p, and p4broker in
/p4/common/bin are indeed shell scripts, not binaries.

Also silenced configurable checks and some other checks that should
be skipped if '-skip p4root' is specified.

#review @russell_jackson
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