##### 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)]
```

from ansible.cli.arguments import option_helpers as opt_help
from ansible.errors import AnsibleError, AnsibleOptionsError
from ansible.galaxy import Galaxy, get_collections_galaxy_meta_info
from ansible.galaxy.api import GalaxyAPI
from ansible.galaxy.collection import build_collection, install_collections, publish_collection, \
    validate_collection_name
from ansible.galaxy.login import GalaxyLogin
from ansible.galaxy.role import GalaxyRole
from ansible.galaxy.token import GalaxyToken, NoTokenSentinel
from ansible.module_utils.ansible_release import __version__ as ansible_version
from ansible.module_utils._text import to_bytes, to_native, to_text
from ansible.parsing.yaml.loader import AnsibleLoader
from ansible.playbook.role.requirement import RoleRequirement
from ansible.utils.display import Display
from ansible.utils.plugin_docs import get_versioned_doclink
display = Display()
class GalaxyCLI(CLI):
    '''command to manage Ansible roles in shared repositories, the default of which is Ansible Galaxy *https://galaxy.ansible.com*.'''
    SKIP_INFO_KEYS = ("name", "description", "readme_html", "related", "summary_fields", "average_aw_composite", "average_aw_score", "url")
    def __init__(self, args):
        
        if len(args) > 1 and args[1] not in ['-h', '--help'] and 'role' not in args and 'collection' not in args:
            
            
            idx = 2 if args[1].startswith('-v') else 1
            args.insert(idx, 'role')
        self.api_servers = []
        self.galaxy = None
        super(GalaxyCLI, self).__init__(args)
    def init_parser(self):