title: set custom basePath in drf-yasg
body: <p>I am using <strong>drf-yasg</strong> to document my APIs and I have the following setup,</p>
  <pre><code>from django.urls import path
  from drf_yasg.views import get_schema_view
  
  public_schema_view = get_schema_view(..., urlconf='public_apis.urls')
  private_schema_view = get_schema_view(..., urlconf='private_apis.urls')
  
  urlpatterns = [
      path('public/', public_schema_view.with_ui('swagger', cache_timeout=0), name='schema-public'),
      path('private/', private_schema_view.with_ui('swagger', cache_timeout=0), name='schema-private'),
  ]</code></pre>
  <p><strong>Note:</strong>  The <code>public_schema_view</code> and <code>private_schema_view</code> are renedered two different set of URLs from the modules <code>public_apis.urls</code> and <code>private_apis.urls</code> respectively.</p>
  <p>Here I want to have two <code>basePath</code>s,</p>
  <ol>
  <li><code>/api/v1/public/</code> for <code>public_schema_view</code> and</li>
  <li><code>/api/v1/private/</code> for <code>private_schema_view</code></li>
  </ol>
  <p>So, the question is, how can I set <em>multiple</em> custom <a href="https://swagger.io/docs/specification/2-0/api-host-and-base-path/" rel="nofollow noreferrer"><strong><code>basePath</code></strong></a> in <a href="https://drf-yasg.readthedocs.io/en/stable/index.html" rel="nofollow noreferrer"><strong>drf-yasg</strong></a> ?</p>