Switch to using stock gcovr 5.2 (sonic-net#726)

* Switch to using stock gcovr 5.2

The custom branch we were using previously has since been deleted. That
branch appears to have some fix for searching for the source file (for a
gcda file) recursively. I don't know if it's needed or not today, but
using the stock gcovr 5.2 (from the official repo) appears to work.

Signed-off-by: Saikrishna Arcot <sarcot@microsoft.com>

.azure-pipelines/build-template.yml

@@ -73,14 +73,14 @@ jobs:
   - ${{ if eq(parameters.run_unit_test, true) }}:
     - script: |
         set -ex
-        git clone https://github.com/Spacetown/gcovr.git
+        git clone https://github.com/gcovr/gcovr.git
         cd gcovr/
-        git checkout origin/recursive_search_file
+        git checkout 5.2
         sudo pip3 install setuptools
         sudo python3 setup.py install
         cd ..
         sudo rm -rf gcovr
-      displayName: "Install gcovr 5.0 with recursive fix"
+      displayName: "Install gcovr 5.2 (for --exclude-throw-branches support)"
     - script: |
         set -ex
         sudo pip install Pympler==0.8
@@ -98,7 +98,7 @@ jobs:
         redis-cli FLUSHALL
         pytest --cov=. --cov-report=xml
         mv coverage.xml tests/coverage.xml
-        gcovr -r ./ -e ".*/swsscommon_wrap.cpp" --exclude-unreachable-branches --exclude-throw-branches -x --xml-pretty  -o coverage.xml
+        gcovr -r ./ -e ".*/swsscommon_wrap.cpp" --exclude-unreachable-branches --exclude-throw-branches --gcov-ignore-parse-errors -x --xml-pretty  -o coverage.xml
       displayName: "Run swss common unit tests"
   - publish: $(System.DefaultWorkingDirectory)/
     artifact: ${{ parameters.artifact_name }}