support 2.11 bootstrap_strategy and derive default_cfg

	* feat: support bootstrap_strategy (2.11)
	* feat: derive load_cfg/default_cfg
	* fix: ensure options of box.cfg always cleared before passing
	  to box.cfg (or wrap_box_cfg, or boxcfg)
	* feat: added annotations for config and config.etcd
	* feat: use module-aware logger (2.11 feature)
	* feat: expose load_cfg/{default_cfg,...} to config._load_cfg

.github/workflows/test.yml

@@ -1,4 +1,4 @@
-name: Create and push rockspec for moonlibs/config
+name: Run unit tests
 
 on:
   push:
@@ -7,13 +7,40 @@ env:
   ROCK_NAME: config
 
 jobs:
-  test-matrix:
+  run-luacheck:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@master
+    - uses: tarantool/setup-tarantool@v2
+      with:
+        tarantool-version: '2.10.7'
+    - name: install luacheck 0.26.0
+      run: tarantoolctl rocks install luacheck 0.26.0
+    - name: run luacheck
+      run: .rocks/bin/luacheck .
+  run-unit-tests:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        version: ["1.10.15", "2.8.4", "2.10.6", "2.11.0", "2.11.1"]
+        version: ["1.10.15", "2.8.4", "2.10.6", "2.10.7-gc64-amd64", "2.11.0", "2.11.1"]
     steps:
     - uses: actions/checkout@master
     - uses: docker/setup-buildx-action@v2
     - name: run test suite for ${{matrix.version}}
-      run: make test-${{matrix.version}}
+      run: make test-${{matrix.version}}
+  run-coverage-report:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: tarantool/setup-tarantool@v2
+      with:
+        tarantool-version: '2.10.7'
+    - name: install luacov-console 1.1.0
+      run: tarantoolctl rocks install luacov-console 1.1.0
+    - name: install luacov-coveralls 0.2.3
+      run: tarantoolctl rocks install --server=http://luarocks.org luacov-coveralls 0.2.3
+    - name: prepare coverage report
+      run: .rocks/bin/luacov-console "$(pwd)" && .rocks/bin/luacov-console -s
+    # - name: publish coveralls report
+    #   env:
+    #     COVERALLS_REPO_TOKEN: ${{ secrets.COVERALLS_REPO_TOKEN }}
+    #   run: .rocks/bin/luacov-coveralls -v

.luacov

@@ -0,0 +1,19 @@
+runreport = false
+deletestats = false
+
+exclude = {
+	"spec/",
+	"test/",
+	"test_peek",
+	"%.rocks/",
+	"builtin/",
+}
+
+coveralls = {
+	root = "/",
+	debug = true,
+	pathcorrect = {
+			{ "^/home/runner/work/config/config/", "" },
+			{ "^/source/config", "" },
+	},
+}