Allow specification of shell for the consul user

[jirkafajfr]

Hi,

following two commits are changing shell of the consul user to /bin/nologin (or its variations)

• Use nologin for service user
• Modify user/group creation to use poise-service-user

this configuration prevents consul from executing handler in consul watch with following error:

2016/09/20 21:33:02 [ERR] agent: Failed to invoke watch handler 'XYZ': exit status 1

This patch allows wrapper cookbook to specify shell explicitly while retaining "security" for people not using consul watch functionality.

[codecov-io]

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[quulah]

There's also the old issue #271. So the scripts checks seem to be broken too without the user's shell.

[lock]

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