##### SUMMARY
`ansible-galaxy collection install` currently requires the user to specify an install path using the `-p` option. Galaxy currently generates and displays the CLI command for installing a collection. There is no way for Galaxy to determine a value for `-p`, and hard coding a default value into Galaxy makes no sense.

##### ISSUE TYPE
- Bug Report

##### COMPONENT NAME
`ansible-galaxy`

##### ANSIBLE VERSION
<!--- Paste verbatim output from "ansible --version" between quotes -->
```
ansible 2.10.0.dev0
  config file = /etc/ansible/ansible.cfg
  configured module search path = [u'/Users/chouseknecht/.ansible/plugins/modules', u'/usr/share/ansible/plugins/modules']
  ansible python module location = /Users/chouseknecht/projects/ansible/lib/ansible
  executable location = /Users/chouseknecht/.pyenv/versions/venv27/bin/ansible
  python version = 2.7.14 (default, Nov 14 2017, 23:24:24) [GCC 4.2.1 Compatible Apple LLVM 9.0.0 (clang-900.0.38)]
```

if isinstance(v, list):
                v = ". ".join([l.rstrip('.') for l in v])
            v = link_pattern.sub(r"\1 <\2>", v)
            v = const_pattern.sub(r"'\1'", v)
            return textwrap.fill(v, width=117, initial_indent="# ", subsequent_indent="# ", break_on_hyphens=False)
        def to_yaml(v):
            return yaml.safe_dump(v, default_flow_style=False).rstrip()
        env = Environment(loader=BaseLoader)
        env.filters['comment_ify'] = comment_ify
        env.filters['to_yaml'] = to_yaml
        template = env.from_string(meta_template)
        meta_value = template.render({'required_config': required_config, 'optional_config': optional_config})
        return meta_value
    def execute_role(self):