Fixed hofund connection tags

[witx98]

Closes #57

Result:

# HELP hofund_info Basic information about application
# TYPE hofund_info gauge
hofund_info{application_name="hofundtest",application_version="0.0.1-SNAPSHOT",id="hofundtest"} 1
# HELP hofund_connection Current status of given connection
# TYPE hofund_connection gauge
hofund_connection{description="",id="hofundtest-google_http",source="hofundtest",target="google",type="http"} 1.0
hofund_connection{description="PostgreSQL",id="hofundtest-mydatabase_database",source="hofundtest",target="mydatabase_database",type="database"} 1.0
# HELP hofund_edge Information about hofund edge, value is always 1.0, to check status use hofund_connection
# TYPE hofund_edge gauge
hofund_edge{id="hofundtest-google_http",source="hofundtest",target="google",type="http"} 1.0
hofund_edge{id="hofundtest-mydatabase_database",source="hofundtest",target="mydatabase_database",type="database"} 1.0
# HELP hofund_node Information about hofund nodes, value is always 1.0, to check status use hofund_info
# TYPE hofund_node gauge
hofund_node{id="google",subtitle="http ()",title="google_http",type="http"} 1.0
hofund_node{id="hofundtest",subtitle="0.0.1-SNAPSHOT",title="hofundtest",type="app"} 1.0
hofund_node{id="mydatabase_database",subtitle="database (PostgreSQL)",title="mydatabase_database",type="database"} 1.0

[witx98]

@marwin1991

Should we remove parentheses when the description is empty - http ()?