travis-ci: don't deploy 2.5+ pkgs to packagecloud

Now we have S3 based infrastructure for RPM / Deb packages and GitLab CI
pipelines, which deploys packages to it.

We don't plan to add 2.5+ repositories on packagecloud.io, so instead of
usual change of target bucket from 2_N to 2_(N+1), the deploy stage is
removed.

Since all distro specific jobs are duplicated in GitLab CI pipelines and
those Travis-CI jobs are needed just for deployment, it worth to remove
them too.

Follows up #3380.
Part of #4947.

.travis.yml

@@ -33,83 +33,10 @@ jobs:
         os: osx
       - name: "Debug build + test + coverage (Linux, gcc)"
         env: TARGET=coverage
-      # Deploy targets (they also catch distro-specific problems).
-      - name: "CentOS 6 build + deploy RPM"
-        env: OS=el DIST=6
-        if: branch = "master"
-      - name: "CentOS 7 build + test + deploy RPM"
-        env: OS=el DIST=7
-        if: branch = "master"
-      - name: "CentOS 8 build + test + deploy RPM"
-        env: OS=el DIST=8
-        if: branch = "master"
-      - name: "Fedora 28 build + test + deploy RPM"
-        env: OS=fedora DIST=28
-        if: branch = "master"
-      - name: "Fedora 29 build + test + deploy RPM"
-        env: OS=fedora DIST=29
-        if: branch = "master"
-      - name: "Fedora 30 build + test + deploy RPM"
-        env: OS=fedora DIST=30
-        if: branch = "master"
-      - name: "Fedora 31 build + test + deploy RPM"
-        env: OS=fedora DIST=31
-        if: branch = "master"
-      - name: "Ubuntu Trusty (14.04) build + deploy DEB"
-        env: OS=ubuntu DIST=trusty
-        if: branch = "master"
-      - name: "Ubuntu Xenial (16.04) build + deploy DEB"
-        env: OS=ubuntu DIST=xenial
-        if: branch = "master"
-      - name: "Ubuntu Bionic (18.04) build + deploy DEB"
-        env: OS=ubuntu DIST=bionic
-        if: branch = "master"
-      - name: "Ubuntu Eoan (19.10) build + deploy DEB"
-        env: OS=ubuntu DIST=eoan
-        if: branch = "master"
-      - name: "Debian Jessie (8) build + deploy DEB"
-        env: OS=debian DIST=jessie
-        if: branch = "master"
-      - name: "Debian Stretch (9) build + deploy DEB"
-        env: OS=debian DIST=stretch
-        if: branch = "master"
-      - name: "Debian Buster (10) build + deploy DEB"
-        env: OS=debian DIST=buster
-        if: branch = "master"
 
 script:
   - make -f .travis.mk ${TARGET}
 
-before_deploy:
-  - ls -l build/
-
-deploy:
-  # Deploy packages to PackageCloud from master branch (w/o tagged revisions)
-  - provider: packagecloud
-    username: "tarantool"
-    repository: "2_4"
-    token: "${PACKAGECLOUD_TOKEN}"
-    dist: "${OS}/${DIST}"
-    package_glob: build/*.{rpm,deb,dsc}
-    skip_cleanup: true
-    on:
-      repo: tarantool/tarantool
-      branch: "master"
-      condition: -n "${OS}" && -n "${DIST}" && -n "${PACKAGECLOUD_TOKEN}"
-  # Deploy packages to PackageCloud from tagged revisions
-  # https://github.com/travis-ci/travis-ci/issues/7780#issuecomment-302389370
-  - provider: packagecloud
-    username: "tarantool"
-    repository: "2_4"
-    token: "${PACKAGECLOUD_TOKEN}"
-    dist: "${OS}/${DIST}"
-    package_glob: build/*.{rpm,deb,dsc}
-    skip_cleanup: true
-    on:
-      repo: tarantool/tarantool
-      tags: true
-      condition: -n "${OS}" && -n "${DIST}" && -n "${PACKAGECLOUD_TOKEN}"
-
 notifications:
   email:
     recipients: