pjsip: Renamed reset related function and attribute

Ignore-this: 3d346c9acd33f2e7969aac80c1241586

darcs-hash:20130716154647-b22ec-96090fa2670c0760437967f3245f820a2145dab5
pjsip: Reset flag after performing the reset

Ignore-this: 8bdc6f67231f66149706ac5250e18c92

darcs-hash:20130716154716-b22ec-208d1863df9d885eb3bed71e07300274a2950507
pjsip: Removed unnecessary variable

Ignore-this: a7c91bad2ae22651b8dc588d22ea6fb7

darcs-hash:20130716154759-b22ec-e12b2edc65be1d68b24deb44d3a3cccd111d191c