Make the commands executed for SSH+SCP, SSH+SUDO and SSH+INTERACTIVE_SUDO connections configurable

[demobox]

Currently, the sudo connection methods use a two-step approach to copy files to a target location:

1. Files are copied to a staging directory using the connecting user
2. Files are moved to the target location using the sudo user

The command that carries out the second step is (depending on the value of the sudoPreserveAttributesOnCopyFromTempFile property), cp -r or cp -pr. It would be more flexible if the user could configure this command to support arbitrary flags.

[demobox]

See http://support.xebialabs.com/tickets/632 (sorry, private link) for a motivation for making this configurable. A short summary:

"the target user I use on a SunOS machine has the following alias :
alias -x rm="rm -i"
...
The project team says that Overthere should use "/bin/rm" instead of "rm" ... It doesn't seem clean to me and Overthere doesn't allow this at the moment...
And this kind of settings could also be necessary with other unix commands (cp for example maybe ?)"

[vpartington]

That's actually a motivation to make all the commands Overthere use for SSH+SCP, SSH+SUDO and SSH+INTERACTIVE_SUDO configurable.

[demobox]

One Issue To Rule Them All? Or do we consider this simply an incompatible installation/setup of the target environment?

[vpartington]

I'd love to consider it so but the reality is that such hosts exist.

[vpartington]

Renamed the issue to cover all commands executed for SSH+SCP, SSH+SUDO and SSH+INTERACTIVE_SUDO connections. This means this issue also includes #51.