openvz: Add simple testcase for config file parsing function

This testcase passes before the regression is added in f0443765, fails
after that commit and passes again after the regression was fixed.

tests/openvzutilstest.conf

@@ -0,0 +1,41 @@
+# sample config from http://blog.lystor.org.ua/2009/11/openvz-configuration-example.html
+
+ONBOOT="yes"
+
+# Primary parameters
+NUMPROC="8000:8000"
+AVNUMPROC="2257:2257"
+NUMTCPSOCK="8000:8000"
+NUMOTHERSOCK="8000:8000"
+VMGUARPAGES="360000:360000"
+
+# Secondary parameters
+KMEMSIZE="184953241:203448565"
+TCPSNDBUF="28883080:61651080"
+TCPRCVBUF="28883080:61651080"
+OTHERSOCKBUF="14441540:47209540"
+DGRAMRCVBUF="14441540:14441540"
+OOMGUARPAGES="360000:360000"
+PRIVVMPAGES="360000:360000"
+
+# Auxiliary parameters
+LOCKEDPAGES="9030:9030"
+SHMPAGES="15506:15506"
+PHYSPAGES="0:2147483647"
+NUMFILE="72224:72224"
+NUMFLOCK="1000:1100"
+NUMPTY="512:512"
+NUMSIGINFO="1024:1024"
+DCACHESIZE="40389343:41601024"
+NUMIPTENT="200:200"
+DISKSPACE="107733379:118506717"
+DISKINODES="55287781:60816560"
+CPUUNITS="150550"
+
+# Disk quota parameters (in form of softlimit:hardlimit)
+DISKSPACE=""
+DISKINODES=""
+QUOTATIME=""
+DISK_QUOTA=no
+OSTEMPLATE="rhel-5-lystor"
+IP_ADDRESS="194.44.18.88"