get-template-library: code modernization

- Replace -a by &&

src/scripts/get-template-library

@@ -382,7 +382,7 @@ do
   # In fact branch_pattern can be a regexp matched against existing branch names
   if [ ${use_tags} -eq 1 ]
   then
-    if [ -n "${quattor_version}" -a ${ignore_version} -eq 0 ]
+    if [ -n "${quattor_version}" ] && [ ${ignore_version} -eq 0 ]
     then
       if [ ${tags_ignore_pattern} -eq 1 ]
       then
@@ -422,7 +422,7 @@ do
     if [ ${use_tags} -eq 0 ]
     then
       pr_actual_target=${branch_or_tag}
-      if [ "${branch_or_tag}" = "master" -a $?{master_dir_name} ]
+      if [ "${branch_or_tag}" = "master" ] && [ $?{master_dir_name} ]
       then
         branch_dir=${master_dir_name}
       else
@@ -434,7 +434,7 @@ do
       pr_actual_target=${tag_dir}
       # master is normally not a tag name but master branch can be added to
       # other tags when the version is HEAD (for example for template-library-core)
-      if [ "${tag_dir}" = "master" -a $?{master_dir_name} ]
+      if [ "${tag_dir}" = "master" ] && [ $?{master_dir_name} ]
       then
         tag_dir=${master_dir_name}
       fi
@@ -446,7 +446,7 @@ do
       # If branch_dir is not tag_dir or master, indicates a repository without a master
       # branch (e.g. template-library-grid). In this case, pr_actual_target must be 
       # redefined as branch_dir-tag_dir, as the tag name is prefixed by the branch name (branch_dir).
-      if [ "${branch_dir}" != "master" -a "${branch_dir}" != "${tag_dir}" ]
+      if [ "${branch_dir}" != "master" ] && [ "${branch_dir}" != "${tag_dir}" ]
       then
         pr_actual_target="${branch_dir}-${tag_dir}"
       fi
@@ -459,7 +459,7 @@ do
     for ignore_pattern in ${ignore_branch_patterns}
     do
       [ ${verbose} -eq 1 ] && echo "Branch=${remote_branch}, ignore_pattern = >>${ignore_pattern}<<"
-      if [ -n "$(echo ${branch_dir} | egrep -- ${ignore_pattern})" -a "${branch_dir}" != "${quattor_version}" ]
+      if [ -n "$(echo ${branch_dir} | egrep -- ${ignore_pattern})" ] && [ "${branch_dir}" != "${quattor_version}" ]
       then
         [ ${verbose} -eq 1 ] && echo "Branch ${remote_branch} ignored"
         ignore_branch=1
@@ -470,7 +470,7 @@ do
     for ignore_pattern in ${ignore_version_patterns}
     do
       [ ${verbose} -eq 1 ] && echo "Branch=${remote_branch}, version=${tag_dir}, ignore_version_pattern = >>${ignore_pattern}<<"
-      if [ -n "$(echo ${tag_dir} | egrep -- ${ignore_pattern})" -a "${tag_dir}" != "${quattor_version}" ]
+      if [ -n "$(echo ${tag_dir} | egrep -- ${ignore_pattern})" ] && [ "${tag_dir}" != "${quattor_version}" ]
       then
         [ ${verbose} -eq 1 ] && echo "Branch ${remote_branch} (version ${tag_dir}) ignored"
         ignore_branch=1
@@ -486,7 +486,7 @@ do
     # If --continuous-inegration and the current repo/target matches the CI context, just define src_dir
     # to be what has been checked out as part of the CI.
     [ ${verbose} -eq 1 ] && echo "use_ci_work_dir=${use_ci_work_dir}, repo_name=${repo_name}, pr_repo=${pr_repo}, pr_target=${pr_target}, pr_actual_target=${pr_actual_target}"
-    if [ ${use_ci_work_dir} -eq 1 -a "${pr_repo}" = "${repo_name}" -a "${pr_target}" = "${pr_actual_target}" ]
+    if [ ${use_ci_work_dir} -eq 1 ] && [ "${pr_repo}" = "${repo_name}" ] && [ "${pr_target}" = "${pr_actual_target}" ]
     then
         src_dir=${ci_work_dir}
 
@@ -500,7 +500,7 @@ do
       if [ -n "${pull_request}" ]
       then
         [ ${verbose} -eq 1 ] && echo "Checking if pull request applies to current branch/tag (pr_repo=${pr_repo}, pr_target=${pr_target}, pr_actual_target=${pr_actual_target})..."
-        if [ "${pr_repo}" = "${repo_name}" -a "${pr_target}" = "${pr_actual_target}" ]
+        if [ "${pr_repo}" = "${repo_name}" ] && [ "${pr_target}" = "${pr_actual_target}" ]
         then
           echo "Merging pull request from ${pr_user}/${pr_branch} into branch/tag ${branch_or_tag}..."
           pr_remote=${git_url_root}/${pr_user}/${pr_repo}
@@ -567,7 +567,7 @@ do
   fi
 
   # Except if --debug has been specified, remove Git clone created
-  if [ ${verbose} -eq 0 -a -d ${repo_dir} ]
+  if [ ${verbose} -eq 0 ] && [ -d ${repo_dir} ]
   then
     rm -Rf ${repo_dir}
   fi
@@ -577,7 +577,7 @@ done      # repository loop
 # cluster.build.properties: update version used to the requested Quattor version.
 # Ine the case of HEAD, use the directory the master branch has been checkout to/
 
-if [ ${list_branches} -eq 0 -a ${cluster_build_properties_update} -eq 1 ]
+if [ ${list_branches} -eq 0 ] && [ ${cluster_build_properties_update} -eq 1 ]
 then
   property_files=$(find ${template_lib_root}/clusters -name cluster.build.properties)
   if [ -n "${property_files}" ]