Add install_requirements.r

[drew2a]

This PR is a part of #6505

Now our tunnel experiments are broken because:

R version 4.0.4 (2021-02-15) -- "Lost Library Book"

> library(ggplot2)
Error: package or namespace load failed for ‘ggplot2’:
 package ‘ggplot2’ was installed before R 4.0.0: please re-install it
Execution halted

See full console output

The last successful build is: https://jenkins-ci.tribler.org/job/tunnel_experiments/job/speed_test_exit/177/ and regarding it's console output it has been run under R version 3.5.2

R version 3.5.2 (2018-12-20) -- "Eggshell Igloo"

So, to fix the run we have just to install the following packages:

library(ggplot2)
library(reshape2)

But this error could happen again when the R version has been updated.

I propose to use the file install_requirements.r to automatically install all the necessary dependencies.

ref: https://datatofish.com/install-package-r/

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[drew2a]

I tried to execute Jenkins job with the following command:

R --no-save < $PWD/tribler/scripts/experiments/tunnel_community/install_requirements.r

and got this error:

> install.packages("ggplot2")
Installing package into ‘/usr/local/lib/R/site-library’
(as ‘lib’ is unspecified)
Warning in install.packages("ggplot2") :
  'lib = "/usr/local/lib/R/site-library"' is not writable
Error in install.packages("ggplot2") : unable to install packages
Execution halted

References:

• https://stackoverflow.com/questions/32540919/library-is-not-writable
• https://cran.r-project.org/doc/manuals/r-release/R-intro.html#Packages
• https://kbroman.org/pkg_primer/pages/build.html

[drew2a]

The execution of these commands also ends unsuccessfully:

export R_LIBS_USER=$R_LIBS_USER${R_LIBS_USER:+:}$HOME/R
R --no-save < $PWD/tribler/scripts/experiments/tunnel_community/install_requirements.r

[drew2a]

How to install missed packages: https://stackoverflow.com/questions/4090169/elegant-way-to-check-for-missing-packages-and-install-them