Azure/azure-xplat-cli — pull request #1506 by waitingkuo (2014-12-27 20:55:04+00:00)
Title: correct the help message for the default docker cert path

Modify the help message for the default docker certs dir from .docker/ to ~/.docker/

### Origin
MacBook-Pro:asm willy$ azure vm docker create -h
help: Create a VM
help:
help: Usage: vm docker create [options] [password]
help:
help: Options:
help: -h, --help output usage information
help: -v, --verbose use verbose output
help: --json use json output
help: -p, --docker-port [port] Port to use for docker [4243]
help: -C, --docker-cert-dir [dir] Directory containing docker certs [.docker/]

### New
MacBook-Pro:asm willy$ azure vm docker create -h
help: Create a VM
help:
help: Usage: vm docker create [options] [password]
help:
help: Options:
help: -h, --help output usage information
help: -v, --verbose use verbose output
help: --json use json output
help: -p, --docker-port [port] Port to use for docker [4243]
help: -C, --docker-cert-dir [dir] Directory containing docker certs [~/.docker/]

Signed-off-by: Wei-Ting Kuo