Revert "Correct R travis setup (mlflow#1259)" (mlflow#1271)

This reverts commit 601d75f.

.travis.yml

@@ -45,8 +45,10 @@ matrix:
         - source ./travis/install-common-deps.sh
       script:
         - cd mlflow/R/mlflow
-        - export LINTR_COMMENT_BOT=false
+        - R CMD build .
+        - R CMD check --no-build-vignettes --no-manual --no-tests mlflow*tar.gz
         - cd tests
+        - export LINTR_COMMENT_BOT=false
         - Rscript ../.travis.R
       after_success:
         - export COVR_RUNNING=true

mlflow/R/mlflow/.travis.R

@@ -2,8 +2,6 @@ parent_dir <- dir("../", full.names = TRUE)
 package <- parent_dir[grepl("mlflow_", parent_dir)]
 install.packages(package)
 install.packages("keras", repos='http://cran.rstudio.com/')
-install.packages("roxygen2")
 library(keras)
 install_keras()
-devtools::check(error_on = "warning", args = "--no-tests")
 source("testthat.R")