Fix uses of deprecated request parameter jspPage in plugins

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 6.1.1 CE GA2, 6.1.20 EE GA2
• Fix Version/s: 6.1.30 EE GA3, 6.2.0 CE M4
• Component/s: Dev Tools, Dev Tools > Plugins SDK
• Labels: None
• Branch Version/s:
  6.1.x
• Backported to Branch:
  Committed
• Fix Priority: 3

Since LPS-24216, we are using mvcPath instead of jspPage but we never fully changed it for our plugins. As a result, many of the friendly urls are broken.