factoring out the repository path to be able to switch between centos and centos-staging

Former-commit-id: 50416091

roles/config_repos/templates/monashhpc_base.repo.j2

@@ -2,24 +2,24 @@
 
 [monashhpc_base]
 name=MonashHPC base repository mirrored to control the update process
-baseurl=https://{{ reposervername }}/centos/$releasever/os/$basearch/
+baseurl=https://{{ reposervername }}/{{ repopath }}/$releasever/os/$basearch/
 enabled=1
 sslverify=false
 
 [monashhpc_updates]
 name=MonashHPC base repository mirrored to control the update process
-baseurl=https://{{ reposervername }}/centos/$releasever/updates/$basearch/
+baseurl=https://{{ reposervername }}/{{ repopath }}/$releasever/updates/$basearch/
 enabled=1
 sslverify=false
 
 [monashhpc_extras]
 name=MonashHPC base repository mirrored to control the update process
-baseurl=https://{{ reposervername }}/centos/$releasever/extras/$basearch/
+baseurl=https://{{ reposervername }}/{{ repopath }}/$releasever/extras/$basearch/
 enabled=1
 sslverify=false
 
 [monashhpc_centosplus]
 name=MonashHPC base repository mirrored to control the update process
-baseurl=https://{{ reposervername }}/centos/$releasever/centosplus/$basearch/
+baseurl=https://{{ reposervername }}/{{ repopath }}/$releasever/centosplus/$basearch/
 enabled=1
 sslverify=false

roles/config_repos/templates/monashhpc_others.repo.j2

@@ -2,7 +2,7 @@
 
 [monashhpc_otherstuff]
 name=MonashHPC base repository mirrored to control the update process
-baseurl=https://{{ reposervername }}/centos/hpcsystems/$releasever/$basearch/
+baseurl=https://{{ reposervername }}/{{ repopath }}/hpcsystems/$releasever/$basearch/
 enabled=1
 sslverify=false
 gpgcheck=0