TT#61954 Add RuntimeDirectory directives for systemd service files

The daemon requires these directories to be present, and will otherwise
refuse to start.

Change-Id: I90ebd15dc465200cdace531ed7bf2fe5aa845eed

debian/ngcp-kamailio.kamailio-lb.service

@@ -14,6 +14,9 @@ Type=simple
 User=kamailio
 Group=kamailio
 PIDFile=/run/kamailio/kamailio.lb.pid
+RuntimeDirectory=kamailio
+RuntimeDirectoryMode=0750
+RuntimeDirectoryPreserve=yes
 Environment='LD_PRELOAD=/usr/lib/x86_64-linux-gnu/kamailio/openssl_mutex_shared/openssl_mutex_shared.so'
 Environment='CFGFILE=/etc/kamailio/lb/kamailio.cfg'
 # Values of SHM_MEMORY=64 and PKG_MEMORY=16 taken from old sysvinit file

debian/ngcp-kamailio.kamailio-proxy.service

@@ -13,6 +13,9 @@ Requires=mariadb.service
 Type=simple
 User=kamailio
 Group=kamailio
+RuntimeDirectory=kamailio
+RuntimeDirectoryMode=0750
+RuntimeDirectoryPreserve=yes
 PIDFile=/run/kamailio/kamailio.proxy.pid
 Environment='CFGFILE=/etc/kamailio/proxy/kamailio.cfg'
 # Values of SHM_MEMORY=125 and PKG_MEMORY=32 taken from old sysvinit file