Set start value to avoid conflicting start values.

Set start value for hPip(fluid(T)) to avoid
a warning about conflicting start values in Dymola 2015 FD01.
Removed invalid protected keyword.
Removed redundant connection
Removed access to conditional instance.
Added start value.

Set T(start=T_default) and p(start=p_default) in the
ThermodynamicState record. Setting the start value for
T is required to avoid an error due to conflicting start values
when checking
Buildings.Examples.VAVReheat.ClosedLoop in pedantic mode.
Removed compressibility of water and conflicting start values