EL: Always call depmod

Right now we call depmod for EL 8. Based on #1139, we should call it for EL 7, and perhaps for EL 6 as well.

@EricEdens, here's a permalink, before it runs away (the one in ticket is already off by 10 or so lines):

compute-image-tools/daisy_workflows/image_import/enterprise_linux/translate.py

Lines 166 to 168 in 746981f

    
           if el_release == '8' and not g.exists( 
        
               os.path.join('/lib/modules', kver, 'modules.dep')): 
        
             g.command(['depmod', kver])

	if el_release == '8' and not g.exists(
	os.path.join('/lib/modules', kver, 'modules.dep')):
	g.command(['depmod', kver])