add optional maintainers property to package (#5230)

* add optional package maintainers

lib/spack/spack/cmd/info.py

@@ -162,6 +162,11 @@ def print_text_info(pkg):
 
     color.cprint(section_title('Homepage: ') + pkg.homepage)
 
+    if len(pkg.maintainers) > 0:
+        mnt = " ".join(['@@' + m for m in pkg.maintainers])
+        color.cprint('')
+        color.cprint(section_title('Maintainers: ') + mnt)
+
     color.cprint('')
     color.cprint(section_title('Preferred version:  '))
 

lib/spack/spack/package.py

@@ -545,6 +545,10 @@ class SomePackage(Package):
     # Verbosity level, preserved across installs.
     _verbose = None
 
+    #: List of strings which contains GitHub usernames of package maintainers.
+    #: Do not include @ here in order not to unnecessarily ping the users.
+    maintainers = []
+
     def __init__(self, spec):
         # this determines how the package should be built.
         self.spec = spec