Remove duplication of some share exceptions.

Change-Id: Iff8701813b553c7f9ca401f376d93133786b56a9
CIFSNetConfShare: remove unused method.

Change-Id: I9bc9b37f9c5d18d62a3af15e1f0010b6abf9f9f1
Change messages of shares exceptions.

Change-Id: Idcbb28fb5a90736d250c0d9646bdeed9f40a85cf
Use specific exception for share backend errors.

Change-Id: I94f6387c347fed2259f2e4491ebad5adc0dfd714
Extend message of ShareAccessExists exception

Change-Id: I16a233c7525b2b9bdb10d6a58991030ef214eba1
Don't check access_type at deny_access

Change-Id: I6412c72610205d10639a4bd2d538d09d419bfa5c
CIFSNetConfHelper: proper force at deny_access.

Change-Id: Ia8a1a22ca6737692532b7726a2a7d965819e2665
Cover CIFSNetConf by unit tests

Change-Id: Ia95d758cb898fb31cfe36bbe2c20edc0e02b0f08