[SPARK-10500][SPARKR] sparkr.zip cannot be created if /R/lib is unwritable

The basic idea is that:
The archive of the SparkR package itself, that is sparkr.zip, is created during build process and is contained in the Spark binary distribution. No change to it after the distribution is installed as the directory it resides ($SPARK_HOME/R/lib) may not be writable.

When there is R source code contained in jars or Spark packages specified with "--jars" or "--packages" command line option, a temporary directory is created by calling Utils.createTempDir() where the R packages built from the R source code will be installed. The temporary directory is writable, and won't interfere with each other when there are multiple SparkR sessions, and will be deleted when this SparkR session ends. The R binary packages installed in the temporary directory then are packed into an archive named rpkg.zip.

sparkr.zip and rpkg.zip are distributed to the cluster in YARN modes.

The distribution of rpkg.zip in Standalone modes is not supported in this PR, and will be address in another PR.

Various R files are updated to accept multiple lib paths (one is for SparkR package, the other is for other R packages)  so that these package can be accessed in R.

Author: Sun Rui <rui.sun@intel.com>

Closes #9390 from sun-rui/SPARK-10500.