Remove Dockerfile.travislogin as its not being used anywhere (#4647)

openshift-ci/build-root/Dockerfile.travislogin

@@ -1,39 +0,0 @@
-# Dockerfile to bootstrap build and test in openshift-ci
-
-FROM registry.svc.ci.openshift.org/openshift/release:golang-1.13
-
-RUN yum install sudo -y \
-    make \
-    wget \
-    gcc \
-    git \
-    httpd-tools \
-    ruby \
-    ruby-devel \
-    gcc-c++ \
-    patch \
-    readline \
-    readline-devel \
-    zlib \
-    zlib-devel \
-    libffi-devel \
-    openssl-devel \
-    bzip2 \
-    autoconf \
-    automake \
-    libtool \
-    bison \
-    sqlite-devel
-
-RUN sudo curl -sSL https://rvm.io/mpapis.asc | gpg2 --import -
-RUN sleep 5
-RUN sudo curl -sSL https://rvm.io/pkuczynski.asc | gpg2 --import -
-
-RUN curl -L get.rvm.io | bash -s stable
-
-RUN source /etc/profile.d/rvm.sh
-RUN /bin/bash -l -c "rvm reload && \
-    rvm requirements run && \
-    rvm install 2.7 && \
-    ruby --version && \
-    gem install travis --pre --no-document"