Rename casablanca patch file

Since there is no difference in patching between 3.0.0 and 3.0.1
release there name of patchfile that includes this tag
is unnecessary and confusing.

Issue-ID: OOM-1687

Change-Id: I751398f15c38dab83e36ed0b8f555533497291f8
Signed-off-by: Milan Verespej <m.verespej@partner.samsung.com>
diff --git a/build/fetch_and_patch_charts.sh b/build/fetch_and_patch_charts.sh
index cde4265..2c1312e 100755
--- a/build/fetch_and_patch_charts.sh
+++ b/build/fetch_and_patch_charts.sh
@@ -37,7 +37,7 @@
 usage () {
     echo "Usage:"
     echo -e "./$(basename $0) <helm charts repo> <commit/tag/branch> <patchfile> <target_dir>\n"
-    echo "Example: ./$(basename $0) https://gerrit.onap.org/r/oom 3.0.0-ONAP /root/offline-installer/patches/casablanca_3.0.0.patch /root/offline-installer/ansible/application/helm_charts"
+    echo "Example: ./$(basename $0) https://gerrit.onap.org/r/oom 3.0.0-ONAP /root/offline-installer/patches/casablanca.patch /root/offline-installer/ansible/application/helm_charts"
 }
 
 if [ "$#" -ne 4 ]; then
diff --git a/docs/BuildGuide.rst b/docs/BuildGuide.rst
index 4cf8d97..96c1fbf 100644
--- a/docs/BuildGuide.rst
+++ b/docs/BuildGuide.rst
@@ -296,7 +296,7 @@
 
 For example:
 
-``$ ./build/fetch_and_patch_charts.sh https://gerrit.onap.org/r/oom 3.0.0-ONAP /tmp/offline-installer/patches/casablanca_3.0.0.patch /tmp/oom-clone``
+``$ ./build/fetch_and_patch_charts.sh https://gerrit.onap.org/r/oom 3.0.0-ONAP /tmp/offline-installer/patches/casablanca.patch /tmp/oom-clone``
 
 Part 5. Creating offline installation package
 ---------------------------------------------
diff --git a/patches/casablanca_3.0.0.patch b/patches/casablanca.patch
similarity index 100%
rename from patches/casablanca_3.0.0.patch
rename to patches/casablanca.patch