Fix boost process call for SEL Clear again

The boost::process::seach_path() call to find journalctl caused the
library to fail to register the OEM IPMI commands.  This change
uses the hardcoded path to journalctl instead.

Tested: Verified that the OEM commands are getting registered from
the library and that SEL Clear executes the journalctl call.

Change-Id: Ibfe3aff170269b4395d9ab5ad5dc81ff68b63886
Signed-off-by: Jason M. Bills <jason.m.bills@linux.intel.com>
diff --git a/src/storagecommands.cpp b/src/storagecommands.cpp
index ad9d182..1d294f9 100644
--- a/src/storagecommands.cpp
+++ b/src/storagecommands.cpp
@@ -1041,13 +1041,11 @@
 
     // Clear the SEL by by rotating the journal to start a new file then
     // vacuuming to keep only the new file
-    if (boost::process::system(boost::process::search_path("journalctl"),
-                               "--rotate") != 0)
+    if (boost::process::system("/bin/journalctl", "--rotate") != 0)
     {
         return IPMI_CC_UNSPECIFIED_ERROR;
     }
-    if (boost::process::system(boost::process::search_path("journalctl"),
-                               "--vacuum-files=1") != 0)
+    if (boost::process::system("/bin/journalctl", "--vacuum-files=1") != 0)
     {
         return IPMI_CC_UNSPECIFIED_ERROR;
     }