support shells other than bash

[johrstrom]

We allow apps and so on to set the shell_path but if it's not bash, it basically won't work. export doesn't exist in csh for example.

So these won't work for example

ood_core/lib/ood_core/batch_connect/template.rb

Lines 268 to 270 in 01de647

	# Export useful connection variables
	export host
	export port

┆Issue is synchronized with this Asana task by Unito

[treydock]

Use setenv for csh. Also might be good that instead of --export=NONE do --export=SHELL that way if something like SSSD is setting shell based on LDAP for user on web node, that same shell can be used for job.