Ledctl help refactor.

[bkucman]

• adding help for ledctl mods,
• add explicit --ibpi mode, backward compatibility remains.
  • add help tests. Fixes: #123

[mtkaczyk]

We are ok with some of those checkpatch errors- please list them in pull and say why we should ignore them. Please fix other errors like trailing whitespaces :)

[bkucman]

@mtkaczyk

• trailing whitespaces fixed in commit Checkpatch fixes. 7280d5c
• `WARNING:SUSPECT_CODE_INDENT: suspect code indent for conditional statements (16, 16)

  790: FILE: src/ledctl/ledctl.c:1089:` - fixed in commit Checkpatch fixes. 7280d5c

We are ok with "WARNING:SPLIT_STRING: quoted string split across lines", can be omitted in the review.

Chackpatch errors WARNING:COMMIT_MESSAGE: Missing commit description - Add an appropriate one and ERROR:MISSING_SIGN_OFF: Missing Signed-off-by: line(s) :may be omitted because I plan to squash this PR

[mtkaczyk]

@mtkaczyk

• trailing whitespaces fixed in commit Checkpatch fixes. 7280d5c
• WARNING:SUSPECT_CODE_INDENT: suspect code indent for conditional statements (16, 16) #790: FILE: src/ledctl/ledctl.c:1089: - fixed in commit Checkpatch fixes. 7280d5c

Ok but I have no chance to quick check if it is really done so I would recommend you to squash "checkpatch fixes" with first commit to remove not wanted warning messages.

[bkucman]

@mtkaczyk The changes after review are merged to one commit.