[Bug 1692420] [NEW] [SRU] powerpc-utils commans exhibits "command substitution: ignored null byte in input" warning message

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[Impact]

The current version of powerpc-utils in Ubuntu Zesty and Artful carries
a bug exposed by bash 4.4+ which causes a warning to be logged to stderr
in 4 different commands: ls-veth, ls-vscsi, lsdevinfo, and ofpathname.
Bash is unable to store the NUL bytes in the result of a command
substitution, prior to 4.4 it silently dropped the NUL bytes, but since
4.4 it drops the NUL bytes with a warning: "command substitution:
ignored null byte in input".

Additionally to that the ofpathname command also had a bug that caused a
"cd: too many arguments" warning.

Upstream has fixed both [1] and they now need to be backport to Zesty.

[Test Case 1]

Call any of the affected commands without arguments, they should output
"command substitution: ignored null byte in input" to stderr.

The same warning can easily be reproduced in bash 4.4+ by executing:
$ x=$(cat < /proc/$$/cmdline)
bash: warning: command substitution: ignored null byte in input

And to fix it:
$ x=$(tr -d '\0' < /proc/$$/cmdline)
<no output, as expected>

[Test Case 2]
Call ofpathname with no arguments:
$ ofpathname
cd: too many arguments

[Regression Potential]

The replacement of 'cat' with 'tr -d "\0"' causes no regression. Also,
both commands are part of coreutils.

The 'cd' fix replaces it with a drop_dir call. In case the requested
path is not found then the previous behavior would be kept (ie. no
directory change).

[Other Info]

Upstream fix link:
[1] https://github.com/ibm-power-utilities/powerpc-utils/commit/4fcc611a09caea70e6bca6a1275211c72ac4bb45

[Old description]
Please cherry pick...

https://github.com/ibm-power-utilities/powerpc-
utils/commit/4fcc611a09caea70e6bca6a1275211c72ac4bb45

** Affects: ubuntu-power-systems
     Importance: Medium
     Assignee: Canonical Foundations Team (canonical-foundations)
         Status: New

** Affects: powerpc-utils (Ubuntu)
     Importance: Medium
     Assignee: Canonical Foundations Team (canonical-foundations)
         Status: Triaged


** Tags: architecture-ppc64le bugnameltc-150352 patch severity-medium targetmilestone-inin1704 triage-r ubuntu-17.04
-- 
[SRU] powerpc-utils commans exhibits "command substitution: ignored null byte in input" warning message
https://bugs.launchpad.net/bugs/1692420
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