CLI support to run test files

[divyashreej]

fixes issue #5

This PR does the following:

1. A new CLI entry point that serves as a starting point to run multiple test files or test files in a folder
2. Enable verbose logging

[divyashreej]

**Test run output:

1. run multiple files with verbose:

binnacle -vvv test/test_rest_apis.py test/test_commands_docker.py

[Running] test/test_rest_apis.py
URL: GET /api/v1/folders
Expected Status: 403
Actual Status: 403
OK [ 9.30ms] [ 1] file=test/test_rest_apis.py:9 [http_get("/api/v1/folders", status=403) ]
URL: GET /api/v1/folders
Expected Status: 401
Actual Status: 401
OK [ 3.44ms] [ 2] file=test/test_rest_apis.py:13 [http_get("/api/v1/folders", status=401) ]
URL: GET /api/v1/folders
Expected Status: 200
Actual Status: 200
OK [ 3.54ms] [ 3] file=test/test_rest_apis.py:17 [data = http_get("/api/v1/folders") ]
{
"folders": [
"folder1",
"folder2",
"folder3"

]
}

OK [ 0.12ms] [ 4] file=test/test_rest_apis.py:20 [folders = validated_json(data) ]
OK [ 0.03ms] [ 5] file=test/test_rest_apis.py:21 [validated_json('{"name": 100}') ]

Summary:
OK [186.56ms] total=5 passed=5 failed=0

[Running] test/test_commands_docker.py
OK [375.29ms] [ 1] file=test/test_commands_docker.py:8 [command_run("echo 'Hello World!' > /root/r...]
OK [235.26ms] [ 2] file=test/test_commands_docker.py:9 [command_run("stat /root/reports.txt") rep...]
OK [224.75ms] [ 3] file=test/test_commands_docker.py:10 [command_run("stat /root/reports1.txt 2>/de...]

Summary:
OK [968.86ms] total=3 passed=3 failed=0

2. run a folder with verbose

binnacle -vvv test

[Running] test/test_commands_docker.py
OK [169.94ms] [ 1] file=test/test_commands_docker.py:8 [command_run("echo 'Hello World!' > /root/r...]
OK [202.87ms] [ 2] file=test/test_commands_docker.py:9 [command_run("stat /root/reports.txt") rep...]
OK [176.42ms] [ 3] file=test/test_commands_docker.py:10 [command_run("stat /root/reports1.txt 2>/de...]

Summary:
OK [692.69ms] total=3 passed=3 failed=0

[Running] test/test_commands_local.py
OK [ 0.03ms] [ 1] file=test/test_commands_local.py:4 [validated_json('{"name": 100}') ]
OK [ 14.91ms] [ 2] file=test/test_commands_local.py:5 [command_run("ls /tmp") ]
OK [ 5.12ms] [ 3] file=test/test_commands_local.py:6 [command_run("stat /home/ubuntu/reports.pdf...]
**