Update docs regarding changing the protobuf url and skip the cache

[johnewart]

Signed-off-by: John Ewart [email protected]

Description

Changed the docs (they had incorrect property names regarding protobuf files) and added skipCache=true to the wget tasks because the files are small and it causes unexpected behavior when changing the protobuf URL (in that it keeps using a cached version even after using mvn clean and git clean which makes life a bit confusing until you realize they are being cached in $HOME/.m2/repository/.cache) so that it will always re-download protobuf definitions.

Also moved the base URL to point to master (@artursouza requested it but it seems like a good idea to keep the SDK up-to-date with whatever the latest protobuf definitions are).

Note that this will not re-download the protobuf files on every build, only when they are not already present (i.e if you do a mvn clean or git clean to remove target directories and other auto-generated bits.)

Issue reference

This fixes issue #792

Checklist

Please make sure you've completed the relevant tasks for this PR, out of the following list:

• [x] Code compiles correctly
• [NA] Created/updated tests
• [x] Extended the documentation

[codecov[bot]]

Codecov Report

Merging #793 (98d86f7) into master (5a2833c) will decrease coverage by 0.39%. The diff coverage is n/a.

:exclamation: Current head 98d86f7 differs from pull request most recent head 71f679f. Consider uploading reports for the commit 71f679f to get more accurate results

@@             Coverage Diff              @@
##             master     #793      +/-   ##
============================================
- Coverage     76.64%   76.25%   -0.40%     
+ Complexity     1145     1119      -26     
============================================
  Files           104      101       -3     
  Lines          3627     3516     -111     
  Branches        418      410       -8     
============================================
- Hits           2780     2681      -99     
+ Misses          639      637       -2     
+ Partials        208      198      -10     

Impacted Files	Coverage Δ
.../java/io/dapr/client/domain/ConfigurationItem.java	50.00% <0.00%> (-6.25%)	:arrow_down:
...rc/main/java/io/dapr/exceptions/DaprException.java	70.37% <0.00%> (-3.71%)	:arrow_down:
...c/main/java/io/dapr/client/AbstractDaprClient.java	85.10% <0.00%> (-2.40%)	:arrow_down:
...k/src/main/java/io/dapr/client/DaprClientGrpc.java	90.04% <0.00%> (-0.50%)	:arrow_down:
.../src/main/java/io/dapr/springboot/DaprRuntime.java	0.00% <0.00%> (ø)
...r/client/domain/SubscribeConfigurationRequest.java	77.77% <0.00%> (ø)
...lient/domain/UnsubscribeConfigurationResponse.java
...client/domain/UnsubscribeConfigurationRequest.java
.../client/domain/SubscribeConfigurationResponse.java
...k/src/main/java/io/dapr/client/DaprClientHttp.java	87.81% <0.00%> (+0.78%)	:arrow_up:
... and 2 more

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