Further cleanup, move signal setup to a file of its own.

finit.c:
        o Perform signal setup as soon as possible, no need to do any
          mounting of /proc or /sys beforehand
        o Move signal setup and callbacks to a file of its own
        o Use more #defines for hard coded strings
        o Use a more neutral default hostname

signal.c:
        o New file, for setup and signal handlers
        o Add support for SIGSTOP/SIGSTP and SIGCONT.  This pauses finit
          respawning of xinit/shell.  Useful for, e.g., debugging
        o Document each ignored and handled signal better
        o Disable SIGUSR1 and SIGUSR2 for now, will be reenabled later

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>

Makefile

@@ -28,7 +28,7 @@ ROOTDIR    ?= $(shell pwd)
 VERSION     = 1.0-pre
 PKG	    = finit-$(VERSION)
 EXEC        = finit
-OBJS        = finit.o helpers.o initctl.o
+OBJS        = finit.o helpers.o initctl.o signal.o
 SRCS        = $(OBJS:.o=.c)
 DEPS        = $(addprefix .,$(SRCS:.c=.d))
 CPPFLAGS   += -DVERSION=\"$(VERSION)\" -DWHOAMI=\"`whoami`@`hostname`\"