Validate param prevents authentication, even though it should not

[vpolimenov]

Describe the bug When using validate param it fails to authenticate, even though it should not.

To Reproduce

1. Generate a token
2. JIRA(basic_auth=(<email>,<token>),options={'server': url,'agile_rest_path': 'agile',},max_retries=0,validate=True,)
3. You should get jira.exceptions.JIRAError: Login failed

1. Generate a token or use the same token from above
2. jira_auth = JIRA(basic_auth=(<email>,<token>),options={'server': url,'agile_rest_path': 'agile',},max_retries=0,)
3. Login successful -> jira_auth.projects() should return a list of projects

Expected behavior I would expect validate=True to fail only if email or token is incorrect

Stack Trace

*** jira.exceptions.JIRAError: JiraError HTTP 401 url: https://<instance>/rest/auth/1/session
        text: Login failed

        response headers = {'Server': 'AtlassianProxy/1.15.8.1', 'WWW-Authenticate': 'JIRA REST POST, OAuth realm="https%3A%2F%<instance>"', 'Cache-Control': 'no-cache, no-store, no-transform', 'Content-Type': 'application/json;charset=UTF-8', 'Strict-Transport-Security': 'max-age=315360000; includeSubDomains; preload', 'Date': 'Tue, 11 Aug 2020 08:59:57 GMT', 'ATL-TraceId': 'aa0a61d3ea36daf9', 'X-AREQUESTID': '12f6ba79-684e-4d4c-b2ed-5d6a2598a3de', 'X-AACCOUNTID': '557058%3Af4b2bb21-261e-4623-9ad6-fd3a087cbbce', 'X-XSS-Protection': '1; mode=block', 'Transfer-Encoding': 'chunked', 'Timing-Allow-Origin': '*', 'X-Content-Type-Options': 'nosniff', 'Micros-Issuer': 'micros/edge-authenticator', 'Connection': 'keep-alive', 'Set-Cookie': 'atlassian.xsrf.token=abc2e086-300f-4fda-9f72-a5237537b05b_8a2c6b656d38311e461b73185f288414a4f7d0a0_lin; Path=/; Secure', 'Expect-CT': 'report-uri="https://web-security-reports.services.atlassian.com/expect-ct-report/global-proxy", enforce, max-age=86400'}
        response text = {"errorMessages":["Login failed"],"errors":{}}

Version Information Python Interpreter: Python 3.6.9 jira-python: jira==2.0.0 OS: NAME="Ubuntu" / VERSION="19.10 (Eoan Ermine)"