Correct spellingerrors in execute.tcl

Corret some spellingerrors in execute.tcl
Fix spelling errors and Gramatical errors in execute.tcl

Fix of 1 more spelling error and a gramatical error.
Also rewrote EOF to big letters to get same over entire file
Merge pull request #9 from itayo/master

Fix spellingerrors in execute.tcl
Add extra OPTS to ssh

Add configuration variable SSH_OPTS, where the user can pass additional
options to the ssh
invocation.
Change-Id: I30b2c6609fc16182adb9b5a8004eefb7639ab9b2