lvm: disable lvmetad

Currently dracut uses lvm.conf as found in the system and modifies only
global/locking_type setting. As there's a new feature introduced - the lvmetad
daemon, dracut should disable its use as well by setting "global/use_lvmetad=0"
(patch attached).

Otherwise, there's a warning message issued:

dracut: WARNING: Failed to connect to lvmetad: No such file or directory.
Falling back to internal scanning.

@@ -, +, @@
 modules.d/90lvm/lvm_scan.sh     |    2 ++
 modules.d/90lvm/module-setup.sh |    1 +
 2 files changed, 3 insertions(+), 0 deletions(-)

modules.d/90lvm/lvm_scan.sh

@@ -35,10 +35,12 @@ if [ ! -e /etc/lvm/lvm.conf ]; then
         if [ -n $SNAPSHOT ]; then
             echo 'global {';
             echo '    locking_type = 1';
+            echo '    use_lvmetad = 0';
             echo '}';
         else
             echo 'global {';
             echo '    locking_type = 4';
+            echo '    use_lvmetad = 0';
             echo '}';
         fi
     } > /etc/lvm/lvm.conf

modules.d/90lvm/module-setup.sh

@@ -49,6 +49,7 @@ install() {
             # FIXME: near-term hack to establish read-only locking;
             # use command-line lvm.conf editor once it is available
             sed -i -e 's/\(^[[:space:]]*\)locking_type[[:space:]]*=[[:space:]]*[[:digit:]]/\1locking_type = 4/' ${initdir}/etc/lvm/lvm.conf
+            sed -i -e 's/\(^[[:space:]]*\)use_lvmetad[[:space:]]*=[[:space:]]*[[:digit:]]/\1use_lvmetad = 0/' ${initdir}/etc/lvm/lvm.conf
         fi
     fi