Fixed naming of the test cases

Fixed naming of the test cases

The device is not "mounted" but "configured" on Netconf and
it is not "removed" but "deconfigured". The testcase names
were patched but the NetconfKeyword keywords (some of which
also have this problem) were left intact because changing
them is much more expensive operation in terms of time due
to the nonexistence of coding style checking tool. Also some
documentation strings needed this type of terminology fixing.

Change-Id: I4f63395e95d49f95b61ed7d73fcaf4e8c7714556
Signed-off-by: Jozef Behran <jbehran@cisco.com>