Fixing compatibility with pubsub emulator

[bilisie]

It seems that the google pubsub emulator complains about redundant subscription/publisher names on creation (as they're present in both the payload and the post URL).

I've opened a ticket with google about fixing this on their end but they seem unwilling to do so: https://github.com/GoogleCloudPlatform/google-cloud-java/issues/2199

Here's a sample project that helps reproduce the issue that's being addressed here: https://github.com/bilisie/pubsub-emulator-issue

I've ran the integration tests against prod APIs and I've also tested the code against the emulator.

[codecov-io]

Codecov Report

Merging #30 into master will increase coverage by 0.47%. The diff coverage is 100%.

@@             Coverage Diff              @@
##             master      #30      +/-   ##
============================================
+ Coverage     75.83%   76.31%   +0.47%     
- Complexity      189      191       +2     
============================================
  Files            25       25              
  Lines           894      895       +1     
  Branches         59       59              
============================================
+ Hits            678      683       +5     
+ Misses          183      181       -2     
+ Partials         33       31       -2

Impacted Files	Coverage Δ	Complexity Δ
...otify/google/cloud/pubsub/client/Subscription.java	83.33% <100%> (+1.51%)	7 <1> (+1)	:arrow_up:
...com/spotify/google/cloud/pubsub/client/Pubsub.java	76.19% <100%> (ø)	50 <0> (-1)	:arrow_down:
.../com/spotify/google/cloud/pubsub/client/Acker.java	87.03% <0%> (+3.7%)	20% <0%> (+2%)	:arrow_up:

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[bilisie]

I believe this is related to the current issue that's being reported:

https://github.com/spotify/async-google-pubsub-client/issues/29

[danielnorberg]

LGTM, thanks!