info-provider: fix capitalisation of SRM in ControlProtocol

The glue ControlProtocol has a Type field that describes what kind
of protocol is being published; or SRM, this value should be 'SRM'.
Commit 9eab932c altered the capitalisation to 'srm', which is
picked up as an error.

This patch restores the published value to SRM.  It also removes a
mapping since all supported versions of dCache have an SRM family
of either 'SRM' or 'srm'.

Target: master
Patch: http://rb.dcache.org/r/6892/
Acked-by: Tigran Mkrtchyan
Request: 2.8
Request: 2.7
Merge pull request #493 from paulmillar/fix/2.8/srm-in-glue

info-provider: fix capitalisation of SRM in ControlProtocol