How to restrict wordpress plugin installation just on one website (preventing multi site install)?

How to restrict wordpress plugin installation just on one website
(preventing multi site install)?

References

Reference NO 1

http://stackoverflow.com/questions/15198962/how-to-restrict-wordpress-plugin-installation-just-on-one-website-preventing-mu

Reference NO 2

http://codex.wordpress.org/Multisite_Network_Administration

Reference NO 3

http://wordpress.org/support/topic/multisite-plugin-question-can-i-suppress-some

Reference NO 4

http://codex.wordpress.org/Test_Driving_WordPress

Reference NO 5

http://wp.tutsplus.com/tutorials/using-wordpress-multisite-a-network-of-websites-at-your-fingertips/

Reference NO 6

http://wpmu.org/20-essential-plugins-for-wordpress-multisite/

Reference NO 7

http://wpcandy.com/teaches/how-to-enable-multisite/

Reference NO 8

http://ithemes.com/purchase/backupbuddy/