Replace Travis CI with GH Actions

- Added workflow for GH Actions with building and testing
- Removed Jenkinsfile, Travis CI config and old scripts for running
  testing

There are also tests that run with target 'make test-memcached-capable' and memtier
benchmark, but both blocked by [1] and [2].

1. #80
2. #81

Part of #75

Author: ligurio

.github/workflows/testing.yaml

@@ -0,0 +1,45 @@
+name: Testing
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  testing:
+    if: |
+      github.event_name == 'push' ||
+      github.event_name == 'pull_request' && github.event.pull_request.head.repo.full_name != github.repository
+    strategy:
+      matrix:
+        tarantool-version: ['1.10', '2.2', '2.3', '2.4', '2.5', '2.6', '2.7', '2.8']
+      fail-fast: false
+    runs-on: [ubuntu-latest]
+    steps:
+      - name: Clone the repository
+        uses: actions/checkout@v2
+        with:
+          repository: ${{ github.repository_owner }}/memcached
+          # Enable recursive submodules checkout as test-run git module is used
+          # for running tests.
+          submodules: recursive
+
+      - name: Setup Tarantool
+        uses: tarantool/setup-tarantool@v1
+        with:
+          tarantool-version: ${{ matrix.tarantool-version }}
+
+      - name: Install build requirements
+        run: sudo apt-get -y install libsasl2-dev
+
+      - run: cmake .
+
+      - name: Setup Python 2 for tests
+        uses: actions/setup-python@v2
+        with:
+          python-version: 2.7
+
+      - name: Install test requirements
+        run: pip install -r test-run/requirements.txt
+
+      - run: make test-memcached
+      #- run: make test-memcached-capable