MFC r320269:

style fixes in bin/echo/tests

Submitted by: shivansh
Reviewed by: asomers
X-MFC-With: 319626
Sponsored by: Google, Inc (GSoC 2017)
Differential Revision: https://reviews.freebsd.org/D11318

MFC r319626:

Add basic tests for echo(1)

Verify that echo(1) does not...
- ... print the trailing newline character with option '-n'.
- ... print the trailing newline character when '\c' is appended to
the end of the string.

Add basic tests for echo(1)

Verify that echo(1) does not...
- ... print the trailing newline character with option '-n'.
- ... print the trailing newline character when '\c' is appended to
the end of the string.

Submitted by: shivansh
Reviewed by: asomers, ngie
MFC after: 1 month
Sponsored by: Google, Inc (GSoC 2017)
Differential Revision: D11036