update install scripts

[prasadtalasila]

Updates the install scripts with the following improvements.

• Tomcat 8.5 installation with the URL coming from Apache EU mirror
• Updates node.js to 8.9x
• Removes errors in the tomcat.service file
• Improves the code in install.sh shell script

@raghavagrawal please review the changes proposed here.

[codecov-io]

Codecov Report

Merging #164 into dev will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##              dev     #164   +/-   ##
=======================================
  Coverage   55.23%   55.23%           
=======================================
  Files          46       46           
  Lines        1260     1260           
  Branches      103      103           
=======================================
  Hits          696      696           
  Misses        541      541           
  Partials       23       23

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[prasadtalasila]

@adityaketkar can you see any reason for the reduction in code coverage in this PR?

[adityaketkar]

@prasadtalasila I think there is something wrong with codecov report. Please see the screenshot below :

After I going through the commit diff's, I am pretty sure that the src/main/* files are untouched by those commits. But still, the report suggests that lines were added to the branch. Is it possible to rerun the analysis?

[prasadtalasila]

@adityaketkar I rebased the tomcat8 branch with the dev branch. Now the codecov is showing a correct report. Please verify the same.

[prasadtalasila]

@raghavagrawal one unaddressed issue is the use of --prefix. You said that you were facing problems. Can you please elaborate on the problems and give a log?