pservice: initial version

The can be convenient for running commands or services as procd services
without needing to separately write initscripts, just uci configuration.

The package was imported from [1].

 [1] https://github.com/yousong/waller/tree/0a85f5c75fb70627f68cbbcab4807e02e3299e2e/pservice

Ref: https://github.com/yousong/waller/issues/1
Signed-off-by: Yousong Zhou <yszhou4tech@gmail.com>

utils/pservice/files/pservice.config

@@ -0,0 +1,24 @@
+config pservice
+	option disabled 1
+	option name 'demo0'
+	option command /bin/sh
+	option respawn_maxfail 0
+	list args -c
+	list args 'env | logger -t $name; exec sleep $time'
+	list env 'v0=0'
+	list env 'v1=val with space'
+	list env 'name=demo0'
+	list env 'time=1799'
+	list file /tmp/sleep.conf
+
+config pservice
+	option disabled 1
+	option name 8021x
+	option command /usr/sbin/wpa_supplicant
+	option stdout 1
+	list args -i
+	list args eth0.1
+	list args -D
+	list args wired
+	list args -c
+	list args /etc/wpa_supplicant-eth0.1.conf