CI/CD: drop travis support

It hasn't been tried in years and has likely bit rot by now.

Change-Id: Ia3c725e94ecd544adb8899c05d66828387906625

.travis.yml

@@ -1,25 +0,0 @@
-language: c
-os:
-  - linux
-sudo: required
-dist: trusty
-addons:
-  apt:
-    packages:
-      - autoconf
-      - automake
-      - make
-      - gcc
-      - debhelper
-      - devscripts
-      - libtool
-      - build-essential
-      - pkg-config
-      - libtalloc-dev
-      - libpcsclite-dev
-      - libpcap-dev
-      - libzmq3-dev
-      - libgnutls28-dev
-
-script:
-  - contrib/travis.sh

contrib/travis.sh

@@ -1,27 +0,0 @@
-#!/usr/bin/env bash
-
-set -ex
-
-rm -rf deps/install
-mkdir deps || true
-cd deps
-git clone https://gitea.osmocom.org/osmocom/libosmocore
-
-cd libosmocore
-git reset --hard 460f9ef7da1db11b104fdfe635ebcbd8a071f205
-autoreconf --install --force
-./configure --prefix=$PWD/../install
-make -j 4 install
-export LD_LIBRARY_PATH=$PWD/../install/lib
-
-cd ../
-git clone https://gitea.osmocom.org/cellular-infrastructure/osmo-python-tests
-cd osmo-python-tests
-sudo ./setup.py install
-
-cd ../../
-autoreconf --install --force
-PCAP_LIBS="-lpcap" PCAP_CFLAGS="" PKG_CONFIG_PATH=$PWD/deps/install/lib/pkgconfig ./configure --with-pcap-config=/bin/true --enable-external-tests
-PKG_CONFIG_PATH=$PWD/deps/install/lib/pkgconfig make -j 4
-PKG_CONFIG_PATH=$PWD/deps/install/lib/pkgconfig make check
-DISTCHECK_CONFIGURE_FLAGS="--with-pcap-config=/bin/true" PCAP_LIBS="-lpcap" PCAP_CFLAGS="" PKG_CONFIG_PATH=$PWD/deps/install/lib/pkgconfig LD_LIBRARY_PATH=$PWD/deps/install/lib make distcheck