TT#82051 Shellcheck v0.8 fixes

shellcheck v0.8 has new check, known as SC2295 ("Warn about "${x#$y}"
treating $y as a pattern when not quoted").

Fixes:

| In scripts/build line 117:
|      build_file="${build_file%%.${host}}"
|                                 ^-----^ SC2295 (info): Expansions inside ${..} need to be quoted separately, otherwise they match as patterns.

| In scripts/encrypt line 24:
|       x=${file##${NGCPCTL_MAIN}/templates/}  # drop leading /etc/ngcp-config
|                 ^-------------^ SC2295 (info): Expansions inside ${..} need to be quoted separately, otherwise they match as patterns.

... as reported by our Github actions at
https://github.com/sipwise/ngcpcfg

Change-Id: I3371388ecf445905cca0bc4681276151aceb43ae

scripts/build

@@ -114,7 +114,7 @@ else
         # drop HA file suffix of all registered nodes
         if [ -r /etc/ngcp-config/systems.cfg ] ; then
           while IFS= read -r host ; do
-            build_file="${build_file%%.${host}}"
+            build_file="${build_file%%."${host}"}"
           done < /etc/ngcp-config/systems.cfg
         fi
 

scripts/encrypt

@@ -21,12 +21,12 @@ get_config_file_list() {
   for dir in ${CONFIG_POOL} ; do
     # shellcheck disable=SC2044
     for file in $(find "${TEMPLATE_POOL_BASE}/${dir}" -name \*.tt2 -o -name \*.tt2"${HA_FILE:-}") ; do
-      x=${file##${NGCPCTL_MAIN}/templates/}  # drop leading /etc/ngcp-config
-      y=${x%%.tt2}                           # drop trailing suffix '.tt2'
-      y=${y%%.tt2.sp1}                       # drop trailing suffix '.tt2.sp1'
-      y=${y%%.tt2.sp2}                       # drop trailing suffix '.tt2.sp2'
-      y=${y%%.customtt}                      # drop trailing suffix '.customtt'
-      y=${y%%.patchtt}                       # drop trailing suffix '.patchtt'
+      x=${file##"${NGCPCTL_MAIN}"/templates/} # drop leading /etc/ngcp-config
+      y=${x%%.tt2}                            # drop trailing suffix '.tt2'
+      y=${y%%.tt2.sp1}                        # drop trailing suffix '.tt2.sp1'
+      y=${y%%.tt2.sp2}                        # drop trailing suffix '.tt2.sp2'
+      y=${y%%.customtt}                       # drop trailing suffix '.customtt'
+      y=${y%%.patchtt}                        # drop trailing suffix '.patchtt'
       # if the file does not exist (e.g. because "ngcpcfg apply"
       # hasn't been executed yet for whatever reason, then don't
       # report missing files, otherwise tar will complain