cmd: send version info to stdout

[acud]

This PR sends the bee version command output to stdout. cobra defaults to stderr if output is not explicitly set.

fixes #1648

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This change is 

[mrekucci]

Reviewable status: 0 of 1 files reviewed, all discussions resolved (waiting on @aloknerurkar and @esadakar)

[istae]

Reviewed 1 of 1 files at r1.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @aloknerurkar)

[istae]

Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @aloknerurkar)

[mrekucci]

Reviewable status: all files reviewed, 1 unresolved discussion (waiting on @acud and @aloknerurkar)

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cmd/bee/cmd/version.go, line 23 at r1 (raw file):

		},
	}
	v.SetOut(os.Stdout)

Replace os.Stdout with c.root.OutOrStdout() and this will fix also the failing TestVersionCmd test.

[mrekucci]

Reviewable status: 0 of 2 files reviewed, all discussions resolved (waiting on @aloknerurkar and @esadakar)

[mrekucci]

Reviewed 2 of 2 files at r2.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @aloknerurkar)