More robust command line parsing

Allow multiple spaces or tabs between keyword and argument, also set
hostname only once.

Signed-off-by: Claudio Matsuoka <cmatsuoka@gmail.com>

helpers.h

@@ -4,6 +4,7 @@
 int	makepath	(char *);
 void	ifconfig	(char *, char *, char *, int);
 void	copyfile	(char *, char *, int);
+void	chomp		(char *);
 
 #ifdef BUILTIN_RUNPARTS
 int	run_parts	(char *, ...);