added RedisClient() to return underlaying redis.Client

[wins1908]

Our code is using *redis.Client, we need to add a method to return underlaying redis.client after called WithContext()

[elasticcla]

Hi @wins1908, we have found your signature in our records, but it seems like you have signed with a different e-mail than the one used in your Git commit. Can you please add both of these e-mails into your Github profile (they can be hidden), so we can match your e-mails to your Github profile?

[wins1908]

Hi, I added my company email Could u pls check again? Thanks

…

On Fri, Aug 16, 2019 at 10:25 AM Elastic CLA Checker < ***@***.***> wrote: Hi @wins1908 <https://github.com/wins1908>, we have found your signature in our records, but it seems like you have signed with a different e-mail than the one used in your Git commit <https://github.com/elastic/apm-agent-go/pull/613.patch>. Can you please add both of these e-mails into your Github profile (they can be hidden), so we can match your e-mails to your Github profile? — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#613?email_source=notifications&email_token=ACAI6LYNNPJ3Q4Z6N4HGADTQEYM3RA5CNFSM4IMDT5J2YY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGOD4NR27I#issuecomment-521870717>, or mute the thread <https://github.com/notifications/unsubscribe-auth/ACAI6L2TJOBPDOPGOTRHTFLQEYM3RANCNFSM4IMDT5JQ> .

[axw]

Thanks for the PR @wins1908, LGTM

[axw]

jenkins run the tests please

[codecov-io]

Codecov Report

Merging #613 into master will decrease coverage by 0.04%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master     #613      +/-   ##
==========================================
- Coverage   87.77%   87.72%   -0.05%     
==========================================
  Files         122      122              
  Lines        7483     7489       +6     
==========================================
+ Hits         6568     6570       +2     
- Misses        811      816       +5     
+ Partials      104      103       -1

Impacted Files	Coverage Δ
module/apmgoredis/client.go	77.04% <0%> (-8.41%)	⬇️
tracer.go	89.69% <0%> (+0.32%)	⬆️

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