Abstract the tools framework to allow merging multiple CLI tools together

[sijie]

Descriptions of the changes in this PR:

Motivation

There are multiple CLI tools spreading across multiple places, e.g. new bookkeeper cli, stream storage cli and dlog. There have similar implementations. It would be better to consolidate all these tools in one place bookkeeper-tools.

This is a PR to prepare moving stream/cli to be part of bookkeeper-tools.

Solution

• Abstract the CLI logic in bookkeeper-tools into a simple tools framework that can be reused in a extensible way to unify multiple tools together.
• organize the tools module into tools/framework and tools/all

Result

Example output of the tool using this framework is listed as below:

$ bin/bkctl
bkctl interacts and operates Apache BookKeeper clusters

Usage:  bkctl [flags] [command group] [commands]

Commands:

    bookie          Commands on operating a single bookie
    bookies         Commands on operating a cluster of bookies
    cluster         Commands on administrating bookkeeper clusters
    ledger          Commands on interacting with ledgers
    namespace       Commands on operating namespaces
    table           Commands on interacting with tables
    tables          Commands on operating tables

    help            Display help information about it

Flags:

    -c, --conf
        Configuration file

    -n, --namespace
        Namespace scope to run commands (only valid for table service for now)

    -u, --service-uri
        Service Uri


    -h, --help
        Display help information

Use "bkctl [command] --help" or "bkctl help [command]" for more information
about a command

result from help sub-command

$ bin/bkctl help table
Commands on interacting with tables

Usage:  bkctl table [command] [command options]

Commands:

    get         Get key/value pair from a table
    inc         Increment the amount of a key in a table
    put         Put key/value pair to a table

    help        Display help information about it

Use "bkctl table [command] --help" or "bkctl table help [command]" for more
information about a command

result from help sub-sub-command

$ bin/bkctl table help inc
Increment the amount of a key in a table

Usage:  bkctl table inc [flags] <table> <key> <amount>

Flags:


    -h, --help
        Display help information

Master Issue: #1000

[sijie]

retest this please

[sijie]

retest this please

[sijie]

retest this please