ci: install gcovr via apt

Change-Id: Ie8c85d7d005b52fd7137a05c6a8e13d5232a4f88
refs: #4771
diff --git a/.jenkins.d/00-deps.sh b/.jenkins.d/00-deps.sh
index 66dafb4..84c8ae1 100755
--- a/.jenkins.d/00-deps.sh
+++ b/.jenkins.d/00-deps.sh
@@ -28,7 +28,6 @@
                              libsqlite3-dev libssl-dev
 
     if [[ $JOB_NAME == *"code-coverage" ]]; then
-        sudo apt-get -qy install lcov libgd-perl python-setuptools
-        sudo easy_install --upgrade gcovr
+        sudo apt-get -qy install gcovr lcov libgd-perl
     fi
 fi
diff --git a/.jenkins.d/README.md b/.jenkins.d/README.md
index 39fa40b..5813349 100644
--- a/.jenkins.d/README.md
+++ b/.jenkins.d/README.md
@@ -27,7 +27,7 @@
   Possible values:
 
   * empty: default build process
-  * `code-coverage` (Linux OS is assumed): debug build with tests and code coverage analysis
+  * `code-coverage` (Ubuntu Linux is assumed): debug build with tests and code coverage analysis
   * `limited-build`: only a single debug build with tests
 
 - `CACHE_DIR`: the variable defines a path to folder containing cached files from previous builds,