fwget: add -q for quiet output

Introduce -q to quieten other output (unless -v is also given).

pkg-install(8) currently has no option to allow skipping unavail
packages but it will just fail.
We would realy want to try to install as much firmware found as
possible from the installer.
Work around this by doing one firmware package at a time.
For that it is highly helpful to be able to query (or possibly re-query)
all outstanding fimrware packages.
-q together with -n only shows each package to be installed one by line.

Once freebsd/pkg#2195 will be implemented
we could undo this part of the change and future changes to the installer
and use the new option for pkg-install(8) there.

While here switch to getopts so -qn works and not just -q -n.

Sponsored by:	The FreeBSD Foundation
MFC after:	3 days
Differential Revision: https://reviews.freebsd.org/D47445

usr.sbin/fwget/fwget.sh

@@ -38,7 +38,8 @@ Supported subsystems
   pci
 
 Options:
-  -n		-- Do not install package, only print the results
+  -n		-- Do not install packages, only print the results
+  -q		-- Quiet mode.  If used with -n only prints a package a line
   -v		-- More verbose
 EOF
 	exit 1
@@ -75,22 +76,27 @@ addpkg()
 }
 
 DRY_RUN=n
+QUIET=n
 VERBOSE=n
 
-while [ $# -gt 0 ]; do
-	case $1 in
-		-n)
-			DRY_RUN=y
-			;;
-		-v)
-			VERBOSE=y
-			;;
-		*)
-			subsystems="${subsystems} $1"
-			;;
+while getopts ":nqv" _arg; do
+	case ${_arg} in
+	n)
+		DRY_RUN=y
+		;;
+	q)
+		QUIET=y
+		;;
+	v)
+		VERBOSE=y
+		;;
+	?)
+		usage
+		;;
 	esac
-	shift
 done
+shift $(($OPTIND - 1))
+subsystems="$@"
 
 # Default searching PCI subsystem
 if [ -z "${subsystems}" ]; then
@@ -112,13 +118,25 @@ done
 
 case "${packages}" in
 ""|^[[:space:]]*$)
-	echo "No firmware packages to install."
+	if [ "${QUIET}" != "y" ]; then
+		echo "No firmware packages to install."
+	fi
 	exit 0
 	;;
 esac
 
-echo "Needed firmware packages: '${packages}'"
+if [ "${QUIET}" != "y" ]; then
+	echo "Needed firmware packages: '${packages}'"
+fi
 if [ "${DRY_RUN}" = "y" ]; then
+	if [ "${QUIET}" = "y" ]; then
+		for pkg in ${packages}; do
+			case "${pkg}" in
+			""|^[[:space:]]*$) continue ;;
+			esac
+			echo "${pkg}"
+		done
+	fi
 	exit 0
 fi