[hab] Update hab rumor inject to hab config apply.

[fnichol]

This change also renames the subcommand alias inject to apply.

> hab --help
hab 0.4.0

Authors: The Habitat Maintainers <[email protected]>

"A Habitat is the natural environment for your services" - Alan Turing

USAGE:
    hab [FLAGS] [SUBCOMMAND]

FLAGS:
    -h, --help       Prints help information
    -V, --version    Prints version information

SUBCOMMANDS:
    artifact    Commands relating to Habitat artifacts
    config      Commands relating to Habitat runtime config
    help        Prints this message or the help message of the given subcommand(s)
    origin      Commands relating to Habitat origin keys
    pkg         Commands relating to Habitat packages
    service     Commands relating to Habitat services
    sup         Commands relating to the Habitat Supervisor
    user        Commands relating to Habitat users

ALIASES:
    apply       Alias for: 'config apply'
    install     Alias for: 'pkg install'
    start       Alias for: 'sup start'

> hab config --help
hab-config
Commands relating to Habitat runtime config

USAGE:
    hab config [FLAGS] [SUBCOMMAND]

FLAGS:
    -h, --help    Prints help information

SUBCOMMANDS:
    apply    Applies a configuration to a group of Habitat Supervisors
    help     Prints this message or the help message of the given subcommand(s)

> hab apply --help
hab-apply
Alias for 'config apply'

USAGE:
    hab apply [FLAGS] [OPTIONS] <SERVICE_GROUP> <VERSION_NUMBER> [ARGS]

FLAGS:
    -h, --help    Prints help information

OPTIONS:
    -p, --peers <PEERS>    A comma-delimited list of one or more Habitat Supervisor peers to infect (default: 127.0.0.1:9634)

ARGS:
    <SERVICE_GROUP>     Target service group for this injection (ex: redis.default)
    <VERSION_NUMBER>    A version number (integer) for this configuration (ex: 42)
    [FILE]              Path to local file on disk (ex: /tmp/config.toml, default: <stdin>)

> hab apply --help
hab-apply
Alias for 'config apply'

USAGE:
    hab apply [FLAGS] [OPTIONS] <SERVICE_GROUP> <VERSION_NUMBER> [ARGS]

FLAGS:
    -h, --help    Prints help information

OPTIONS:
    -p, --peers <PEERS>    A comma-delimited list of one or more Habitat Supervisor peers to infect (default: 127.0.0.1:9634)

ARGS:
    <SERVICE_GROUP>     Target service group for this injection (ex: redis.default)
    <VERSION_NUMBER>    A version number (integer) for this configuration (ex: 42)
    [FILE]              Path to local file on disk (ex: /tmp/config.toml, default: <stdin>)

[thesentinels]

By analyzing the blame information on this pull request, we identified @metadave to be a potential reviewer

[bookshelfdave]

looks good!