Spelling fixes in image_manager.cpp

Spelling errors found using github.com/lucasdemarchi/codespell
A tool to fix common misspellings.
This tool is Licensed under GNU General Public License, version 2.

Change-Id: Ia499821e053e2d4280cd74d4020eab6b2febe854
Signed-off-by: Gunnar Mills <gmills@us.ibm.com>
diff --git a/image_manager.cpp b/image_manager.cpp
index 6f49f5d..43edded 100644
--- a/image_manager.cpp
+++ b/image_manager.cpp
@@ -59,7 +59,7 @@
     // Need tmp dir to write MANIFEST file to.
     if (!mkdtemp(const_cast<char*>(tmpDirPath.c_str())))
     {
-        log<level::ERR>("Error occured during mkdtemp",
+        log<level::ERR>("Error occurred during mkdtemp",
                         entry("ERRNO=%d", errno));
         report<InternalFailure>(InternalFail::FAIL("mkdtemp"));
         return -1;
@@ -143,7 +143,7 @@
     }
     if (mkdir(imageDirPath.c_str(), S_IRWXU) != 0)
     {
-        log<level::ERR>("Error occured during mkdir",
+        log<level::ERR>("Error occurred during mkdir",
                         entry("ERRNO=%d", errno));
         report<InternalFailure>(InternalFail::FAIL("mkdir"));
         return -1;
@@ -153,7 +153,7 @@
     auto rc = unTar(tarFilePath, imageDirPath.string());
     if (rc < 0)
     {
-        log<level::ERR>("Error occured during untar");
+        log<level::ERR>("Error occurred during untar");
         return -1;
     }