Trace python opentelemetry

[aravinsiva]

Migrating python-trace-sample docs to OpenTelemetry.

note: requirements.txt will be updated with opentelemetry package once new version that contains opentelemetry exporter has been released.

[googlebot]

We found a Contributor License Agreement for you (the sender of this pull request), but were unable to find agreements for all the commit author(s) or Co-authors. If you authored these, maybe you used a different email address in the git commits than was used to sign the CLA (login here to double check)? If these were authored by someone else, then they will need to sign a CLA as well, and confirm that they're okay with these being contributed to Google.
In order to pass this check, please resolve this problem and then comment @googlebot I fixed it.. If the bot doesn't comment, it means it doesn't think anything has changed.

ℹ️ Googlers: Go here for more info.

[gguuss]

Just a few nits, thank you for the PR!

[googlebot]

A Googler has manually verified that the CLAs look good.

(Googler, please make sure the reason for overriding the CLA status is clearly documented in these comments.)

ℹ️ Googlers: Go here for more info.

[googlebot]

We found a Contributor License Agreement for you (the sender of this pull request), but were unable to find agreements for all the commit author(s) or Co-authors. If you authored these, maybe you used a different email address in the git commits than was used to sign the CLA (login here to double check)? If these were authored by someone else, then they will need to sign a CLA as well, and confirm that they're okay with these being contributed to Google.
In order to pass this check, please resolve this problem and then comment @googlebot I fixed it.. If the bot doesn't comment, it means it doesn't think anything has changed.

ℹ️ Googlers: Go here for more info.

[googlebot]

CLAs look good, thanks!

ℹ️ Googlers: Go here for more info.

[gguuss]

LGTM when lint passes

[busunkim96]

@aravinsiva Please resolve the lint errors:

pip install flake8 flake8-import-order
flake8 --show-source --builtin=gettext --max-complexity=20 --import-order-style=google --exclude=.nox,.cache,env,lib,generated_pb2,*_pb2.py,*_pb2_grpc.py --ignore=E121,E123,E126,E203,E226,E24,E266,E501,E704,W503,W504,I202 --max-line-length=88 --application-import-names main,noxfile,main_test,.nox .
./main.py:18:1: I100 Import statements are in the wrong order. 'import os' should be before 'import time'
import os
^
./main.py:23:1: F401 'opentelemetry.propagators' imported but unused
from opentelemetry import trace, propagators
^
./main.py:23:1: I101 Imported names are in the wrong order. Should be propagators, trace
from opentelemetry import trace, propagators
^
Command flake8 --show-source --builtin=gettext --max-complexity=20 --import-order-style=google --exclude=.nox,.cache,env,lib,generated_pb2,*_pb2.py,*_pb2_grpc.py --ignore=E121,E123,E126,E203,E226,E24,E266,E501,E704,W503,W504,I202 --max-line-length=88 --application-import-names main,noxfile,main_test,.nox . failed with exit code 1
Session lint failed.

[gcf-merge-on-green]

Your PR has attempted to merge for 3 hours. Please check that all required checks have passed, you have an automerge label, and that all your reviewers have approved the PR

[gcf-merge-on-green]

Merge-on-green attempted to merge your PR for 6 hours, but it was not mergeable because either one of your required status checks failed, or one of your required reviews was not approved. Learn more about your required status checks here: https://help.github.com/en/github/administering-a-repository/enabling-required-status-checks. You can remove and reapply the label to re-run the bot.