v0.45 documentation fixes (DataDog#1885)

docs: add troubleshooting section (DataDog#1800)

* add troubleshooting section

* add no traces and support section

* fix typo

update docs for TwL (DataDog#1751)

Co-authored-by: Tahir H. Butt <tahir.butt@datadoghq.com>

update docs for TwL (DataDog#1751)

Co-authored-by: Tahir H. Butt <tahir.butt@datadoghq.com>

feat(dbapi): support Connection context management usage (DataDog#1762)

* fix(psycopg2): add test for connection used with contextmanager

* dbapi: handle Connection __enter__

* psycopg2 < 2.5 connection doesn't support context management

* add dbapi to wordlist

* add tests for mysqldb

* add dbapi tests

* Update ddtrace/contrib/dbapi/__init__.py

Co-authored-by: Julien Danjou <julien@danjou.info>

* add some doc strings

* add test cases for other dbapi libraries

* add test for no context manager

* update comment

Co-authored-by: Kyle Verhoog <kyle.verhoog@datadoghq.com>
Co-authored-by: Julien Danjou <julien@danjou.info>
Co-authored-by: Kyle Verhoog <kyle@verhoog.ca>

update changelog (DataDog#1706)

test(profiling): disable tracer startup logs (DataDog#1704)

They're not useful and slow down the tests.

fix: celery and botocore tests (DataDog#1649)

## Celery

We were specifying celery==4.3 and `kombu==4.4` to run our test cases against.

celery==4.3 has the [dependencies](https://github.com/celery/celery/blob/v4.3.0/requirements/default.txt):
- pytz>dev
- billiard>=3.6.0,<4.0
- kombu>=4.4.0,<5.0
- vine>=1.3.0

Celery is installed first which installs `vine==5.0.0`, the latest version.

`kombu==4.4` has the [dependencies](https://github.com/celery/kombu/blob/v4.4.0/requirements/default.txt)
- amqp>=2.4.0,<3.0

Which installs `amqp==2.6.1` which has the [dependency](https://github.com/celery/py-amqp/blob/v2.6.1/requirements/default.txt)

- vine>=1.1.3, <5.0.0a1

which conflicts with the `vine==5.0.0` installed above 😕 🤦 

This is solved by explicitly stating vine==1.3 as a dependency of celery

## Botocore
The botocore tests had an issue where for some reason the region now has to be explicitly included to `create_bucket` 🤷 


* botocore: specify region

* celery: pin vine version

fix: celery and botocore tests (DataDog#1649)

## Celery

We were specifying celery==4.3 and `kombu==4.4` to run our test cases against.

celery==4.3 has the [dependencies](https://github.com/celery/celery/blob/v4.3.0/requirements/default.txt):
- pytz>dev
- billiard>=3.6.0,<4.0
- kombu>=4.4.0,<5.0
- vine>=1.3.0

Celery is installed first which installs `vine==5.0.0`, the latest version.

`kombu==4.4` has the [dependencies](https://github.com/celery/kombu/blob/v4.4.0/requirements/default.txt)
- amqp>=2.4.0,<3.0

Which installs `amqp==2.6.1` which has the [dependency](https://github.com/celery/py-amqp/blob/v2.6.1/requirements/default.txt)

- vine>=1.1.3, <5.0.0a1

which conflicts with the `vine==5.0.0` installed above 😕 🤦 

This is solved by explicitly stating vine==1.3 as a dependency of celery

## Botocore
The botocore tests had an issue where for some reason the region now has to be explicitly included to `create_bucket` 🤷 


* botocore: specify region

* celery: pin vine version

fix(django): trace mro chain for Django views (DataDog#1625)